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)
سَمِعْتُ رَسُولَ اللهِ ﷺ عَامَ الْفَتْحِ يَقُولُ كُلُّ حِلْفٍ كَانَ فِي الْجَاهِلِيَّةِ لَمْ يَزِدْهُ الْإِسْلَامُ إِلَّا شِدَّةً وَلَا حِلْفَ فِي الْإِسْلَامِ