Numbers 23:19, El is not a man that he should lie. Read the rest of this verse, which speaks about the immutable character of Elohim. (Also see Mal 3:6; Heb 13:8.)
From the beginning in the Garden of Eden (thanks to the lies of Satan the serpent, see Gen 3:1–4), man has been under the spiritual delusion that Elohim changes his word, laws or commandments and that he doesn’t really mean what he says. That is to say, when YHVH gives a command, later on he may change his mind and his commands are no longer applicable to subsequent generations or people-groups.
Down through the ages, church leaders have bought in to this lie of the enemy with regard to validity of the Torah as pertaining to the life of the redeemed believer. But by saying that the Torah is “done away with,” “has been nailed to the cross” “has been fulfilled in Jesus” meaning “he did it for us so that we don’t have to do it,” isn’t this really calling Elohim a liar?
Now consider the numerous places throughout the Bible, the Word of Elohim, where the Torah is revealed as YHVH’s unalterable standard of righteousness for all time and for all people everywhere. (In this regard, read the following scriptures: Ps 119:44, 142, 144, 160, 172; Matt 4:4; 5:18–19; Rom 3:31; 7:12.)
Who is really the liar? Man or Elohim?