Mu'awiya b. Qurra quoted his father as saying:

I came to the Prophet (ﷺ) with a company of Muzaina who swore allegiance to him, and as his buttons were open I put my hand inside his shirt and felt the seal. Abu Dawud transmitted it.

وَعَنْ مُعَاوِيَةَ بْنِ قُرَّةَ عَنْ أَبِيهِ قَالَ: أَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي رَهْطٍ مِنْ مُزَيْنَةَ فَبَايَعُوهُ وَإِنَّهُ لَمُطْلَقُ الْأَزْرَارِ فَأَدْخَلْتُ يَدِي فِي جَيْبِ قَمِيصِهِ فَمَسِسْتُ الْخَاتم. رَوَاهُ أَبُو دَاوُد