Musannaf Ibn Abi Shayba 34:179

Ghundar narrated to us, from Shu'bah, from al-Hakam, from Ibrahim, from Salman al-Farisi, who said: The first thing Allah created of Adam was his head, and he began to look while he was being created. He said: And his two legs remained. When it was after the afternoon (al-'asr), he said: "O my Lord, hasten before the night." That is the saying of the Exalted: "And man is ever hasty."