I heard Anas bin Malik, "Have you ever heard that the Prophet ﷺ said, 'There is no alliance in Islam?' " He replied, "The Prophet ﷺ made alliance between Quraish and the Ansar in my house."  

قُلْتُ لأَنَسٍ ؓ أَبَلَغَكَ أَنَّ النَّبِيَّ ﷺ قَالَ لاَ حِلْفَ فِي الإِسْلاَمِ فَقَالَ قَدْ حَالَفَ النَّبِيُّ ﷺ بَيْنَ قُرَيْشٍ وَالأَنْصَارِ فِي دَارِي