Hadith 8:154
Narrated Ibn Abbas (RA):
Allah's Messenger (ﷺ) ordered a man to put his hand on his mouth when he came to the fifth pronouncement and said, "It would be the deciding one." [Reported by Abu Dawud and an-Nasa'i. It's narrators are reliable].
وَعَنِ اِبْنِ عَبَّاسٍ رَضِيَ اَللَّهُ عَنْهُمَا; { أَنَّ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -أَمَرَ رَجُلاً أَنْ يَضَعَ يَدَهُ عِنْدَ اَلْخَامِسَةِ عَلَى فِيهِ, وَقَالَ: "إِنَّهَا مُوجِبَةٌ" } رَوَاهُ أَبُو دَاوُدَ, وَالنَّسَائِيُّ, وَرِجَالُهُ ثِقَات ٌ