Lev 18:2 "Speak to the sons of Israel and say to them, 'I am the LORD your God.
Lev 18:3 'You shall not do what is done in the land of Egypt where you lived, nor are you to do what is done in the land of Canaan where I am bringing you; you shall not walk in their statutes.
Lev 18:4 'You are to perform My judgments and keep My statutes, to live in accord with them; I am the LORD your God.
Lev 18:5 'So you shall keep My statutes and My judgments, by which a man may live if he does them; I am the LORD.
Joh 14:15 "If you love Me, you will keep My commandments. (NASB)
In the first chapter of John we are taught that Jesus is God in the flesh of a man. In Chapter 14, verse 15 we learn that we are to demonstrate our love for Him in the same manor that we proved our love for our fathers when we were children, through obedience.
People today like to call themselves New Testament Christians and almost take your head off your shoulders if you mention the Law of the Pentateuch. Just the same in Lev. 18:4 we see that God, before His fleshly incarnation, called for the same obedience in the Old Testament as He did in the New.
Num_23:19-20; 1Sa_15:29; Job_23:13; Psa_33:11; Psa_119:89-91; Pro_19:21; Ecc_3:14; Ecc_7:13; Isa_31:2; Isa_40:28; Isa_59:1; Hos_13:14; Mal_3:6; Rom_11:29; Heb_6:17-18; Jam_1:17.
The above verses from both testaments demonstrate and to the Christian prove the Immutability of God. It is a popular lie today that the New Testament, the best commentary ever written on the Bible (the Old Testament) has superseded the Old Testament. That is not true.
The concept is pushed forward by the idea that the Jewish believer had to obey the Law to be saved and that is simply not true. No man, from the time of Abraham, forward has ever been saved by anything but the unmerited grace of God. In the parable of Lazarus and the rich man, the rich man went to Hell, a.k.a. Sheol, and Lazarus went to Paradise, not Heaven, to await the Death of Jesus on the cross as did all the pre-Christ saints
My point is, of course, that these fanciful ideas of refusing to support the Death Penalty, as called for by God/Jesus in the Old Testament is disobedience to God. Folks are, generally, horrified that I support the Death Penalty in any case and they, without fail, assail me with the penalty of stoning for the disobedience of children.
Many, who followed Jesus, abandoned Him because of His difficult doctrines, they are still abandoning Him today. They only go to Church where they will not be required to deal with the whole truth. The prophetic scriptures have warned us of this event when they speak of the ear tickling preachers. (2Tim. 4:3)
There are very few sermons being preached today on Hell Fire and Brimstone. Folks don't want to hear that so the preachers preach sermons that tickle the ears, sad.