At the bedside of someone refusing
He asked his dying uncle for one sentence, and offered to argue his case with it.
أَىْ عَمِّ قُلْ لاَ إِلَهَ إِلاَّ اللَّهُ. أُحَاجُّ لَكَ بِهَا عِنْدَ اللَّهِ
O uncle, say there is no god but Allah, a word by which I will plead for you before Allah.
Where this comes from
Abū Jahl and another kept saying: will you turn from the religion of your father? He kept asking, and the last thing his uncle said was that he was on the religion of ʿAbd al-Muṭṭalib.
The full narration
Narrated Al-Musaiyab:When Abu Talib's death approached, the Prophet (ﷺ) went to him while Abu Jahl and `Abdullah bin Abi Umaiya were present with him. The Prophet (ﷺ) said, "O uncle, say: None has the right to be worshipped except Allah, so that I may argue for your case with it before Allah." On that, Abu Jahl and `Abdullah bin Abu Umaiya said, "O Abu Talib! Do you want to renounce `Abdul Muttalib's religion?" Then the Prophet said, "I will keep on asking (Allah for) forgiveness for you unless I am forbidden to do so." Then there was revealed:-- 'It is not fitting for the Prophet (ﷺ) and those who believe that they should invoke (Allah) for forgiveness for pagans even though they be of kin, after it has become clear to them that they are companions of the Fire
Source
Ṣaḥīḥ al-Bukhārī · 4675
- Agreed upon as authentic (al-Bukhārī / Muslim)