Mishkat al-Masabih 19 Jihad كتاب الجهاد 195

وَعَنْ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ فِي خطْبَة: «أَوْفوا بِحلف الْجَاهِلِيَّة فَإِنَّهُ لَا يزِيد يَعْنِي الْإِسْلَامَ إِلَّا شِدَّةً وَلَا تُحْدِثُوا حَلِفًا فِي الإِسلامِ» . رَوَاهُ الترمذيُّ من طريقِ ابنِ ذَكْوَانَ عَنْ عَمْرٍو وَقَالَ: حَسَنٌ.

‘Amr b. Shu’aib, on his father’s authority, told that his grandfather reported God’s Messenger as saying in the course of his sermon, “Observe fully the alliance made in the pre-Islamic period, for it, i.e. Islam, will only make it stronger; but make no new alliances in Islam.” The source is not given. See Tirmidhi, Siyar , 30