عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا قَالَ أَوَّلُ مَنْ صَلَّى مَعَ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ بَعْدَ خَدِيجَةَ رَضِيَ اللَّهُ عَنْهَا عَلِيٌّ رَضِيَ اللَّهُ عَنْهُ وَقَالَ مَرَّةً أَسْلَمَ
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him), he says: After Sayyidah Khadijah (may Allah be pleased with her), Sayyiduna Ali (may Allah be pleased with him) was the first to pray with the Noble Prophet (peace and blessings be upon him) or to accept Islam.