Narrated Simak ibn Harb:

Simak reported on the authority of a man from his people, on the authority of another man from them: I saw that the standard of the Messenger of Allah ﷺ was yellow.

حَدَّثَنَا عُقْبَةُ بْنُ مُكْرَمٍ، حَدَّثَنَا سَلْمُ بْنُ قُتَيْبَةَ الشَّعِيرِيُّ، عَنْ شُعْبَةَ، عَنْ سِمَاكٍ، عَنْ رَجُلٍ، مِنْ قَوْمِهِ عَنْ آخَرَ، مِنْهُمْ قَالَ رَأَيْتُ رَايَةَ رَسُولِ اللَّهِ ﷺ صَفْرَاءَ .