Sunan an-Nasa'i 3
Sahih Graded by Abu Ghuddah Book of The Book of Purification · Hadith 3 of 5,758أَخْبَرَنَا أَحْمَدُ بْنُ عَبْدَةَ، قَالَ حَدَّثَنَا حَمَّادُ بْنُ زَيْدٍ، قَالَ أَخْبَرَنَا غَيْلاَنُ بْنُ جَرِيرٍ، عَنْ أَبِي بُرْدَةَ، عَنْ أَبِي مُوسَى، قَالَ دَخَلْتُ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ يَسْتَنُّ وَطَرَفُ السِّوَاكِ عَلَى لِسَانِهِ وَهُوَ يَقُولُ " عَأْعَأْ " .
Narrated by Abu Musa said
It was narrated that Abu Musa said:"I came to the Messenger of Allah (ﷺ) when he was using the Siwak, and the end of the Siwak was on his toungue, and he was saying, "'A','a
References
Sunan an-Nasa'i 3
In-book: Book 1, Hadith 3 Source: hadith-api (fawazahmed0)