Abu Huraira said:I used to invite my mother who was a polytheist to accept Islam, and one day when I had invited her and she caused me to hear something about God's messenger which I do not care to repeat[*] I went to him weeping and said, "Messenger of God, supplicate God to guide Abu Huraira's mother." He said, "O God, guide Abu Huraira's mother," so I came out cheered by the Prophet's supplication. When I came to the door, I found it shut, and when she heard the sound of my feet she said, "Stay where you are, Abu Huraira." I heard the splashing of water, and when she had bathed and put on her chemise, but was in too big a hurry to put on her head-covering, she opened the door and said, "I testify, Abu Huraira, that there is no god but God, and I testify that Muhammad is His servant and messenger." I then returned to God's messenger weeping for joy, and he praised God and said some good words. *Or, 'of which I disapproved' Muslim transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب الفضائل والشمائل / 5895
Hadith Gradingالألبانی:صَحِيح | زبیر علی زئی:صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «رواه مسلم (158/ 2491)»