Sirat Ibn Hisham 682
[ أَوَّلُ رَايَةٍ فِي الْإِسْلَامِ كَانَتْ لِعُبَيْدَةَ ] قَالَ ابْنُ إسْحَاقَ: فَكَانَتْ رَايَةُ عُبَيْدَةَ بْنِ الْحَارِثِ - فِيمَا بَلَغَنِي - أَوَّلَ رَايَةٍ عَقَدَهَا رَسُولُ اللَّهِ ﷺ فِي الْإِسْلَامِ، لِأَحَدِ مِنْ الْمُسْلِمِينَ. وَبَعْضُ الْعُلَمَاءِ يَزْعُمُ أَنَّ رَسُولَ اللَّهِ ﷺ بَعَثَهُ حِينَ أَقْبَلَ مِنْ غَزْوَةِ الْأَبْوَاءِ، قَبْلَ أَنْ يَصِلَ إلَى الْمَدِينَةِ
Translation
✧ [The first banner in Islam was for 'Ubaydah] Ibn Isḥāq said: The banner of 'Ubaydah b. al-Ḥārith—as far as I have been informed—was the first banner that the Messenger of God ﷺ tied in Islam, for any one of the Muslims. And some of the scholars claim that the Messenger of God ﷺ sent him when he returned from the expedition of al-Abwā', before he reached Madinah.
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