Augustine of Hippo

(Tr. xliii. 16) He did not fear, but rejoiced to see: he rejoiced in hope, believing, and so by faith saw. It admits of doubt whether He is speaking here of the temporal day of the Lord, that, viz. of His coming in the flesh, or of that day which knows neither rising or setting. I doubt not however that our father Abraham knew the whole: as he says to his servant whom he sent, Put thy hand under my thigh, and swear to me by the God of heaven. (Gen. 24:2) What did that oath signify, but that the God of heaven was to come in the flesh, out of the stock of Abraham.