That enmity is sinful nature as the law of commandments contained in ordinances would expose that sin for how all sinners are judged.
Jesus fulfilled the law by paying the penalty for our sins on the cross.
Matthew 5:17 Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. 18 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
19 Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
You have to ask yourself what Jesus meant in Matthew 5:19 because those who break even the least of His commandments and teaches others so are what? The least in the kingdom of heaven. How can they be the least in the kingdom of heaven for breaking even the least of His commandment?
So think of Jesus fulfilling the law by paying the penalty for our sins which is death on the cross, and so all believers that are born again of the Spirit with that seal of adoption, has that foundation laid by Jesus Christ and He will judge each believer by what they built on that foundation.
1 Corinthians 3:10 According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon.
But let every man take heed how he buildeth thereupon. 11 For other foundation can no man lay than that is laid, which is Jesus Christ.
12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
13 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is. 14 If any man's work abide which he hath built thereupon, he shall receive a reward.
15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire. 16 Know ye not that ye are the temple of God, and that the Spirit of God dwelleth in you? 17 If any man defile the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are.
Even if the believer is denied by Him for being workers of iniquity at the time of His appearing as the Bridegroom, and gets left behind to die, but in according to verse 15, he is still saved as the spirit will be in Heaven awaiting for his resurrection after the great tribulation as vessels unto dishonor in His House, vessels of wood and earth, hence, the least in the kingdom of Heaven Matthew 5:19.
2 Timothy 2:10 Therefore I endure all things for the elect's sakes, that they may also obtain the salvation which is in Christ Jesus with eternal glory. 11
It is a faithful saying: For if we be dead with him, we shall also live with him: 12 If we suffer, we shall also reign with him:
if we deny him, he also will deny us: 13 If we believe not, yet he abideth faithful: he cannot deny himself.
18 Who concerning the truth have erred, saying that the resurrection is past already; and
overthrow the faith of some. 19 Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, let every one that nameth the name of Christ depart from iniquity. 20 But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour. 21 If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work. 22 Flee also youthful lusts: but follow righteousness, faith, charity, peace, with them that call on the Lord out of a pure heart.
Not convinced that Jesus & Paul are saying the same thing?
What defiles the temple of God? Jesus warned His disciples.
Matthew 15: 18 But those things which proceed out of the mouth come forth from the heart; and they defile the man. 19 For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies: 20 These are the things which defile a man: ...
Does that not tie in with what Paul is saying for how He will judge His House at the pre great tribulation rapture event in 1 Corinthians 3:10-17?
Peter gives the same warning.
1 Peter 4:1 Forasmuch then as Christ hath suffered for us in the flesh, arm yourselves likewise with the same mind: for he that hath suffered in the flesh hath ceased from sin; 2 That he no longer should live the rest of his time in the flesh to the lusts of men, but to the will of God. 3 For the time past of our life may suffice us to have wrought the will of the Gentiles, when we walked in lasciviousness, lusts, excess of wine, revellings, banquetings, and abominable idolatries: 4 Wherein they think it strange that ye run not with them to the same excess of riot, speaking evil of you: 5 Who shall give account to him that is ready to judge the quick and the dead. 6 For for this cause was the gospel preached also to them that are dead, that they might be judged according to men in the flesh, but live according to God in the spirit. 7 But the end of all things is at hand: be ye therefore sober, and watch unto prayer.
12 Beloved, think it not strange concerning the fiery trial which is to try you, as though some strange thing happened unto you: 13 But rejoice, inasmuch as ye are partakers of Christ's sufferings; that, when his glory shall be revealed, ye may be glad also with exceeding joy. 14 If ye be reproached for the name of Christ, happy are ye; for the spirit of glory and of God resteth upon you: on their part he is evil spoken of, but on your part he is glorified. 15 But let none of you suffer as a murderer, or as a thief, or as an evildoer, or as a busybody in other men's matters. 16 Yet if any man suffer as a Christian, let him not be ashamed; but let him glorify God on this behalf.
17 For the time is come that judgment must begin at the house of God: and if it first begin at us, what shall the end be of them that obey not the gospel of God? 18 And if the righteous scarcely be saved, where shall the ungodly and the sinner appear? 19 Wherefore let them that suffer according to the will of God commit the keeping of their souls to him in well doing, as unto a faithful Creator.
Jesus warned that believers that are not ready in Luke 12:40-49 as not found abiding in Him & His words as His disciples, will be cut off, note verse 6 of Luke 15:1-8 and be with the unbelievers as they will get stripes per the knowledge they had for not being ready Luke 12:46=48.
Paul gives that same message in Hebrews 12:1-10 about how the Father will scourge ( whipping ) every child He receives in verse 6 so that they may be partakers of His holiness in verse 10. That can only apply to His words in Luke 12:40-49 on those believers not ready as left behind.
The problem here is your emphasis on the believer to do His commandments or the law of Moses, I reckon, when the emphasis is for the believers to believe in Jesus Christ that they are saved simply by having believed in Him and since reconciled with God through Jesus Christ, we are to believe in Jesus Christ as our Good Shepherd & Friend to help us to follow Him daily in walking in the light in fellowship with the Father & the Son.
You should read Acts 15th chapter as His disciples addressed the issue about whether or not the Gentiles had to be circumcised and keep the law of Moses.
Acts 15th Chapter KJV
Before you rip into Paul as if he was abolishing the laws, you should read how His disciples had to settle that issue.