Musnad Ahmad 509:6

'Affan narrated to us, Hammad narrated to us, from 'Ata' ibn al-Sa'ib, from Hafs ibn 'Abd Allah, from Ya'la ibn Murrah, who said: I came to the Messenger of Allah, may Allah bless him and grant him peace, and there was a trace of saffron on me. He said: "Wash it, then wash it, then wash it, then do not return [to it]." He said: So I washed it, and I did not return to it.