There is no alliance (hilf) in Islam but (the hilf) established in the pre-Islamic days (for good). Islam intensifies and strengthens it.
قَالَ رَسُولُ اللَّهِ ﷺ لاَ حِلْفَ فِي الإِسْلاَمِ وَأَيُّمَا حِلْفٍ كَانَ فِي الْجَاهِلِيَّةِ لَمْ يَزِدْهُ الإِسْلاَمُ إِلاَّ شِدَّةً