Sayyidah Asma' bint Abi Bakr (may Allah be pleased with her) said: My mother came to me at the time when she was a polytheist, and this was during the treaty and period in which Quraysh had made a covenant with the Messenger of Allah (peace and blessings be upon him). I said: O Messenger of Allah! My mother has come to me and she desires (my kindness); shall I maintain ties with her? He (peace and blessings be upon him) said: "Yes, maintain ties with your mother."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20713