Genesis 18:32

And he said, Oh, let not the Lord be angry, and I will speak yet but this once: Peradventure ten shall be found there. And he said, I will not destroy it for ten's sake. The entire prayer is a splendid example of the importunity of the believer's prayer. Cf Luke 11:8. That is the chief content of the true intercessory pleading, namely, to ask the Lord for mercy, for forgiveness. Such prayer is well-pleasing to the Lord; for its sake He still preserves the sinful world, giving to the unbelievers time for repentance. The lesson of true prayer cannot be learned too well.