Sayyidah Asma (may Allah be pleased with her) narrated: My mother came from Makkah to Madinah during the truce with Quraysh, while she was a polytheist. I said: O Messenger of Allah! My mother has come to me and she is hoping (for my kindness); shall I maintain ties with her? The Prophet of Allah (peace and blessings be upon him) said to her: "Maintain ties with her."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20575