Charles H. Spurgeon on Psalms 119:122

Be surety for thy servant for good. What David prays to God to be for him, that Christ is for all his people: Hebrews 7:22. He drew nigh to God, struck hands with him, gave his word and bond to pay the debts of his people; put himself in their law place and stead, and became responsible to law and justice for them; engaged to make satisfaction for their sins, to bring in everlasting righteousness for their justification, and to preserve and keep them, and bring them safe to eternal glory and happiness; and this was being a surety for them for good. John Gill.