Sahih Muslim 25bBook 1, Hadith 42
حَدَّثَنَا مُحَمَّدُ بْنُ حَاتِمِ بْنِ مَيْمُونٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، حَدَّثَنَا يَزِيدُ بْنُ كَيْسَانَ، عَنْ أَبِي حَازِمٍ الأَشْجَعِيِّ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم لِعَمِّهِ " قُلْ لاَ إِلَهَ إِلاَّ اللَّهُ أَشْهَدُ لَكَ بِهَا يَوْمَ الْقِيَامَةِ " . قَالَ لَوْلاَ أَنْ تُعَيِّرَنِي قُرَيْشٌ يَقُولُونَ إِنَّمَا حَمَلَهُ عَلَى ذَلِكَ الْجَزَعُ لأَقْرَرْتُ بِهَا عَيْنَكَ فَأَنْزَلَ اللَّهُ { إِنَّكَ لاَ تَهْدِي مَنْ أَحْبَبْتَ وَلَكِنَّ اللَّهَ يَهْدِي مَنْ يَشَاءُ}
Make a profession of it that there is no god but Allah and I will bear testimony (of your being a Muslim) on the Day of judgment. He (Abu Talib) said: Were it not the fear of the Quraysh blaming me (and) saying that it was the fear of (approaching death) that induced me to do so, I would have certainly delighted your eyes. It was then that Allah revealed: "Indeed, [O Muḥammad], you do not guide whom you like, but Allāh guides whom He wills. And He is most knowing of the [rightly] guided."(Quran 28:56).