'Retribution' in the Bible

how will we escape [the penalty] if we ignore such a great salvation [the gospel, the new covenant]? For it was spoken at first by the Lord, and it was confirmed to us and proved authentic by those who personally heard [Him speak],

For we know Him who said, “Vengeance is Mine [retribution and the deliverance of justice rest with Me], I will repay [the wrongdoer].” And again, “The Lord will judge His people.”