Right after what he quotes, in the Bible, he offers up his daughters to the crowd instead of the angels.
What was he offering his daugthers to them for? So they had two more for a golf foursome? (no pun)
It was tradition to protect the visitors, especially those sent by God, at any cost. He was willing to offer his daughters to protect the angels of God from the sodomites. They wanted to rape the male angels, because they found their bodies beautiful.