Musnad Ahmad 509:4

Yazid ibn Harun narrated to us, Mas'udi informed us, from Yunus ibn Khabbab, from Ibn Ya'la ibn Murrah, from his father, who said: The Prophet, peace and blessings of Allah be upon him, used to wipe our faces during prayer and invoke blessings upon us. He said: So one day he came and wiped the faces of those on my right and on my left, but he left me out. That was because I had visited a sister of mine, and I had wiped my face with some saffron. It was said to me: "The Messenger of Allah, peace and blessings of Allah be upon him, only left you out because of what he saw on your face." So I went to a well and entered it, and I washed myself. Then I attended another prayer, and the Prophet, peace and blessings of Allah be upon him, passed by me, wiped my face, invoked blessings upon me, and said: "He has returned to the goodness of his religion, the high one; he has repented, and the sky has poured forth."