But if a man come presumptuously upon his neighbour, to slay him with guile; thou shalt take him from mine altar, that he may die. Exodus 21:14 KJV Commentary https://bible.com/bible/1/exo.21.14.KJV
Take him from my altar, was it in reference to men holding on to the horns of the altar for mercy.
No such mercy shall he find https://bible.com/bible/1/exo.21.14.KJV