[Machine] He said that the Prophet ﷺ commanded Bilal to call the Adhan, so he placed his fingers in his ears. The Prophet ﷺ looked at him but did not object to it. Since that day, this practice became Sunnah. It has been narrated from Ibn Sirin that Bilal used to place his fingers in his ears during some of his Adhans or Iqamahs.
أَنَّهُ قَالَ أَمَرَ رَسُولُ اللهِ ﷺ بِلَالًا أَنْ يُؤَذِّنَ فَجَعَلَ إِصْبَعَيْهِ فِي أُذُنَيْهِ وَرَسُولُ اللهِ ﷺ يَنْظُرُ إِلَيْهِ فَلَمْ يُنْكِرْ ذَلِكَ فَمَضَتِ السُّنَّةُ مِنْ يَوْمَئِذٍ وَرُوِّينَا عَنِ ابْنِ سِيرِينَ أَنَّ بِلَالًا جَعَلَ أُصْبُعَيْهِ فِي أُذُنَيْهِ فِي بَعْضِ أَذَانِهِ أَوْ فِي إِقَامَتِهِ