(John 14:23, 24) In answer Jesus said to him: “If anyone loves me, he will observe my word, and my Father will love him, and we will come to him and make our dwelling with him. 24 Whoever does not love me does not observe my words. The word that you are hearing is not mine, but belongs to the Father who sent me.
"The word that you are hearing is not mine, but belongs to the Father who sent me"
Jesus many times referred to the Old Testaments. Jesus many times said these words, "it is written", "did you not know, it was written"
(2 Timothy 3:16, 17) All Scripture is inspired of God and beneficial for teaching, for reproving, for setting things straight, for disciplining in righteousness, 17 so that the man of God may be fully competent, completely equipped for every good work.
True the many laws given by God no longer exist but the principles still can be applied.