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bukhari:6681 – Abū al-Yamān > Shuʿayb > al-Zuhrī > Saʿīd b. al-Musayyab from his father

When the death of Abu Talib approached, Messenger of Allah ﷺ came to him and said, "Say: La ilaha illallah, a word with which I will be able to defend you before Allah."  

البخاري:٦٦٨١ – حَدَّثَنَا أَبُو الْيَمَانِ أَخْبَرَنَا شُعَيْبٌ عَنِ الزُّهْرِيِّ قَالَ أَخْبَرَنِي سَعِيدُ بْنُ الْمُسَيَّبِ عَنْ أَبِيهِ قَالَ

لَمَّا حَضَرَتْ أَبَا طَالِبٍ الْوَفَاةُ جَاءَهُ رَسُولُ اللَّهِ ﷺ فَقَالَ قُلْ لاَ إِلَهَ إِلاَّ اللَّهُ كَلِمَةً أُحَاجُّ لَكَ بِهَا عِنْدَ اللَّهِ  

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Collected by Suyūṭī
suyuti:9236a –
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السيوطي:٩٢٣٦a –

"أَىْ عَمِّ قُلْ: لَا إِلَهَ إِلَّا اللَّهُ كَلِمةً أُحَاجُّ لَكَ بهَا عِنْدَ اللَّهِ".  

[خ] البخاري [م] مسلم عن ابن المسيب عن أَبيه أَن أَبا طالب لَمَّا حضرته الوفاة قال له النبى ﷺ: فذكره