Acts 1:24-25
(24) And they prayed and said, “You, Lord, who know the hearts of all men, show which one of these two You have chosen
(25) to occupy this ministry and apostleship from which Judas turned aside to go to his own place.”
When the appellation "Lord" appears without reading "Lord Jesus" in Acts 1:24 it is important to keep in mind that whenever the following keys words from this prayer are found elsewhere in Scripture in association with the "Lord" then the "Lord" always refers to the Lord Jesus.
The passages in boldface are from the same author (Luke).
1. The "Lord" occurs along with the same Greek word for "show" (anadeiknymi) in Acts 1:24 - in reference to the Lord Jesus (Luke 10:1).
2. The "Lord" occurs along with the same Greek word for "chosen" (eklegomai) in Acts 1:24 - in reference to the Lord Jesus (Acts 1:2; cf. v. 6; Luke 6:13; cf. vv. 5, 46; John 6:70; cf. v. 68 and John 13:18; cf. vv. 13-14).
3. The "Lord" occurs along with the same Greek word for "ministry" (diakonia) in Acts 1:25 - in reference to the Lord Jesus (Acts 1:17; cf. v. 21; 20:24; 1 Corinthians 12:5; Ephesians 4:12; cf. Ephesians 4:5; Colossians 4:17; 1 Timothy 1:12).
4. The "Lord" occurs along the same Greek word for "apostleship" (apostolē) in Acts 1:25 - in reference to the Lord Jesus (Romans 1:5; cf. Romans 1:4; 1 Corinthians 9:2).
Let's see your evidence that this prayer was not to the Lord Jesus.
The Lord is not always the Lord Jesus. Jesus is Lord of the church, but the Lord of Jesus is God. Jesus said God is the Lord.
Matt 11
25At that time Jesus declared, “I praise You, Father, Lord of heaven and earth, because You have hidden these things from the wise and learned, and revealed them to little children.
Furthermore, when John and Peter prayed in Acts 4, they were not praying to the Lord Jesus. This is demonstrated by the fact that in this prayer they referred to Jesus as the servant of the Sovereign Lord they were praying to.
Acts 4
24When the believers heard this, they lifted up their voices
to God with one accord. “Sovereign Lord,” they said, “You made the heaven and the earth and the sea and everything in them.
Jesus taught the disciples to only pray to the Father.
Matt 6
9So then, this is how you should pray:
‘Our Father in heaven,
hallowed be Your name.
Paul taught them to only pray to the Father:
Philippians 4
6Be anxious for nothing, but in everything, by prayer and petition, with thanksgiving, present your requests to God.