And truth that he brought is: to reject the teaching of his apostles is to reject his teaching (Lk 10:16).
You are rejecting the teaching of Jesus in rejecting the following teachings of the apostles Matthew, Luke, John and Paul, who identify
Jesus as the YHWH of the OT in:
Mt 3:3, Lk 1:67-68, 76 (Isa 40:3) - Jesus is the YHWH of whom the voice calling in the wilderness (John the Baptist) prepared the way.
Ro 10:9, 13 (Joel 2:32) - Paul teaches Jesus is the YHWH of Joel's prophecy that "everyone who calls on the name of YHWH will be saved."
Heb 1:6 (Dt 32:43) - Heb quotes Moses' song referring to YHWH and says it applies to Jesus.
Rev 1:12-18 (Isa 44:6, 48:12) - the man in the vision is Jesus (1:18, 2:8) who identifies himself as the First and the Last which is YHWH identification of himself.
Also:
Rev 21:6, 22:12-13 (Rev 1:8) - the man in the vision (Jesus) identifies himself as the Alpha and Omega of Rev 1:8, which is YHWH.
Rev 21:5-7 (Rev 20:11-13) -Jesus, the one on the throne (Rev 20:11-13 with Jn 5:22, 27, 9:39), is God (Rev 21:7).
The Elohim and YHWH who created all things (Ge 1:1, Is 44:24, Jer 10:16) is Jesus (Jn 1:3, Col 1:16-17, Heb 1:2b, 10).