that the Messenger of Allah ﷺ made bonds of brotherhood among his Companions. So 'Ali came crying saying: "O Messenger of Allah! You have made a bond of brotherhood among your Companions, but you have not made a bond of brotherhood with me and anyone." So the Messenger of Allah ﷺ said to him: "I am your brother, in this life and the next." (Using translation from Tirmidhī 3720)
لَمَّا وَرَدَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ آخَى بَيْنَ أَصْحَابِهِ فَجَاءَ عَلِيٌّ تَدْمَعُ عَيْنَاهُ فَقَالَ يَا رَسُولَ اللَّهِ آخَيْتَ بَيْنَ أَصْحَابِكَ وَلَمْ تُؤَاخِ بَيْنِي وَبَيْنَ أَحَدٍ فَقَالَ رَسُولُ اللَّهِ ﷺ «يَا عَلِيُّ أَنْتَ أَخِي فِي الدُّنْيَا وَالْآخِرَةِ» تَابَعَهُ سَالِمُ بْنُ أَبِي حَفْصَةَ عَنْ جُمَيْعٍ بِزِيَادَةٍ فِي السِّيَاقِ