صحيح البخاري

Narrated Asma 'bint Abi Bakr:

During the period of the peace treaty of Quraish with Allah's Messenger, my mother, accompanied by her father, came to visit me, and she was a pagan. I consulted Allah's Messenger, "O Allah's Messenger! My mother has come to me and she desires to receive a reward from me, shall I keep good relation with her?" He said, "Yes, keep good relation with her."