Jesus teaches the law of GOd:
John 7:16-17, " 16 So Jesus answered them, “My teaching is not mine, but his who sent me. 17 If anyone's will is to do God's will, he will know whether the teaching is from God or whether I am speaking on my own authority."
So your telling hen Jesus says: ", I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law" It not God's law? It nothing will pas it has to already be established.
Matthew 5:17-20, " 17 “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. 18 For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished. 19 Therefore whoever relaxes one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever does them and teaches them will be called great in the kingdom of heaven. 20 For I tell you, unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven.
John 12:44-50, " 44 And Jesus cried out and said, “Whoever believes in me, believes not in me but in him who sent me. 45 And whoever sees me sees him who sent me. 46 I have come into the world as light, so that whoever believes in me may not remain in darkness. 47 If anyone hears my words and does not keep them, I do not judge him; for I did not come to judge the world but to save the world. 48 The one who rejects me and does not receive my words has a judge; the word that I have spoken will judge him on the last day. 49 For I have not spoken on my own authority, but the Father who sent me has himself given me a commandment—what to say and what to speak. 50 And I know that his commandment is eternal life. What I say, therefore, I say as the Father has told me.”