Musannaf Ibn Abi Shaybah 22112 — Those who disliked a teacher's pay

Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) taught a blind man, and thereafter whenever he came to him, the man would give him food. Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him) said: A certain doubt arose in my heart about this, so I asked the Messenger of Allah (peace and blessings be upon him) about it. He (peace and blessings be upon him) said: "If it is something he gives you as a gift (payment), there is no good in it for you; and if it is from his own food and the food of his family, then there is no harm in accepting it."