The First Epistle of Clement to the Corinthians
Clemens Romanus (Clement of Rome)
Clement of Rome. The Apostolic Fathers, Volume 1. Lake, Kirsopp, editor. London: William Heinemann Ltd.; New York: The Macmillan Company, 1912.
And again he says, God led forth Abraham, and said to him, ‘Look up to the Heaven and number the stars, if thou canst number them; so shall thy seed be.’ And Abraham believed God, and it was counted unto him for righteousness.
Because of his faith and hospitality a son was given him in
his old age, and in his obedience he offered him as a sacrifice to God on the mountain[*](Or possibly, with the other reading, on one of the mountains.) which he showed him.