The Messenger of Allah ﷺ as saying: There is no alliance in Islam, and Islam strengthened the alliance made during pre-Islamic days. (Using translation from Abū Dāʾūd 2925)
أَنَّ رَسُولَ اللهِ ﷺ قَالَ «لَا حِلْفَ فِي الْإِسْلَامِ وَأَيُّمَا حِلْفٍ كَانَ فِي الْجَاهِلِيَّةِ فَإِنَّ الْإِسْلَامَ لَمْ يَزِدْهُ إِلَّا شِدَّةً»