Musnad Ahmad — Hadith #44515

Affan told us, he said, Hammam told us, he said, Thabit told us, on the authority of Anas, that Abu Bakr told him, he said, I said to the Prophet, may God bless him and grant him peace. While he was in the cave, he once said, while we were in the cave, “If one of them had looked at his feet, he would have seen us under his feet.” He said, “O Abu Bakr, what do you think of two, of whom God is the third?