Sayyiduna Ammar (may Allah be pleased with him) narrates: Abu Talib used to prepare food for the people of Makkah, and when the Prophet (peace and blessings be upon him) came, he would not sit down without first placing something beneath him. Abu Talib said: "My nephew has a sense of karamah (that is, dignity)."
At-Tabarani recorded it; its chain contains Amr bin Jumay', who is a kadhdhab (liar).