Sahih Muslim 1003
Sahih Muslim · Book 12: The Book of Zakat · The virtue of spending and giving charity to relatives, spuses, children and parents, even if they are idolaters
Asma' bint Abu Bakr reported:
وَحَدَّثَنَا أَبُو كُرَيْبٍ، مُحَمَّدُ بْنُ الْعَلاَءِ حَدَّثَنَا أَبُو أُسَامَةَ ، عَنْ هِشَامٍ ، عَنْ أَبِيهِ ، عَنْ أَسْمَاءَ بِنْتِ أَبِي بَكْرٍ ، قَالَتْ قَدِمَتْ عَلَىَّ أُمِّي وَهِيَ مُشْرِكَةٌ فِي عَهْدِ قُرَيْشٍ إِذْ عَاهَدَهُمْ فَاسْتَفْتَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقُلْتُ يَا رَسُولَ اللَّهِ قَدِمَتْ عَلَىَّ أُمِّي وَهْىَ رَاغِبَةٌ أَفَأَصِلُ أُمِّي قَالَ " نَعَمْ صِلِي أُمَّكِ " .
My mother who was a polytheist came to me when he (the Holy Prophet) entered into treaty with, the Quraish (of Mecca). I inquired from the Messenger of Allah (ﷺ) saying: Messenger of Allah, there has come to me my mother and she is inclined; should I (in this state of her mind) show her kindness? He said: Yes, treat her kindly.