‘YHWH is slow to anger and abounding in steadfast love, forgiving iniquity and transgression, but he will by no means clear the guilty, visiting the iniquity of the fathers on the children, to the third and the fourth generation.’
Numbers 14:18

This is what it means to "turn the other cheek": to be slow to anger as Adonai is slow to anger, abounding in mercy and forgiveness.