Sahih Bukhari Volume 3, Book 51, Hadith 2621

حَدَّثَنَا عُبَيْدُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ أَسْمَاءَ بِنْتِ أَبِي بَكْرٍ ـ رضى الله عنهما ـ قَالَتْ قَدِمَتْ عَلَىَّ أُمِّي وَهْىَ مُشْرِكَةٌ، فِي عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم، فَاسْتَفْتَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم قُلْتُ ‏{‏إِنَّ أُمِّي قَدِمَتْ‏}‏ وَهْىَ رَاغِبَةٌ، أَفَأَصِلُ أُمِّي قَالَ ‏"‏ نَعَمْ صِلِي أُمَّكِ ‏"‏‏.‏

Narrated By Asma' bint Abu Bakr : My mother came to me during the lifetime of Allah's Apostle and she was a pagan. I said to Allah's Apostle (seeking his verdict), "My mother has come to me and she desires to receive a reward from me, shall I keep good relations with her?" The Prophet said, "Yes, keep good relation with her."