Musnad Ahmad 32:685

Abu Kamil narrated to us, Hammad ibn Zayd narrated to us, Salam al-Alawi narrated to us, he said: I heard Anas ibn Malik say: The Prophet, peace and blessings of Allah be upon him, saw yellow coloring on a man—or he said: a trace of yellow coloring. He said: So when he stood up, he said: "If you had ordered this man to wash this yellow coloring off himself." He said: And he would hardly ever confront anyone to their face with something they disliked.