It is narrated from Sayyiduna Khidash Abu Salamah (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) said: "I enjoin a man (to be good) to his mother, I enjoin a man (to be good) to his father, I enjoin a man (to be good) to his mawla who is closest to him, even if some harm should reach him from him."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4170