that 'Amr bin 'Abdullah bin Safwan informed him, that Kaladah bin Hanbal had informed him, that Safwan bin Umayyah sent him to bring some milk, colostrum, and Daghabis (a type of herb) to the Prophet ﷺ while he was in the upper valley. (He said): "I entered upon him without seeking permission nor giving Salam. The Prophet ﷺ said: 'Go back and say: As-Salamu Alaykum, may I enter?'" And that was after Safwan had accepted Islam." (Using translation from Tirmidhī 2710)   

أَخْبَرَهُ أَنَّ صَفْوَانَ بْنَ أُمَيَّةَ بَعَثَهُ فِي الْفَتْحِ إِلَى النَّبِيِّ ﷺ بِلَبَنٍ وَجَدَايَةٍ وَضَغَابِيسَ وَالنَّبِيُّ ﷺ بِأَعْلَى الْوَادِي قَالَ فَدَخَلْتُ عَلَيْهِ وَلَمْ أُسَلِّمْ وَلَمْ أَسْتَأْذِنْ فَقَالَ النَّبِيُّ ﷺ ارْجِعْ فَقُلِ السَّلَامُ عَلَيْكُمْ أَأَدْخُلُ؟ وَذَلِكَ بَعْدَمَا أَسْلَمَ صَفْوَانُ قَالَ عَمْرٌو وَأَخْبَرَنِي هَذَا الْخَبَرَ أُمَيَّةُ بْنُ صَفْوَانَ أَيْضًا وَلَمْ يَقُلْ أُمَيَّةُ سَمِعْتُهُ مِنْ كِلْدَةَ