The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
20/11. Chapter:
Mentioning the discrepancies reported from Abu Hasin 'Uthman Bin 'Asim in this hadith
Sunan an-Nasai
أَخْبَرَنَا أَحْمَدُ بْنُ سُلَيْمَانَ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، قَالَ أَنْبَأَنَا إِسْرَائِيلُ، عَنْ أَبِي حَصِينٍ، عَنْ شَقِيقٍ، قَالَ كُنَّا نُؤْمَرُ إِذَا قُمْنَا مِنَ اللَّيْلِ أَنْ نَشُوصَ أَفْوَاهَنَا بِالسِّوَاكِ .
It was narrated that Shaqiq said: "We were commanded, when we got up to pray at night, to clean our mouths with the siwak."
Reference : Sunan an-Nasa'i 1624In-book reference : Book 20, Hadith 27English translation : Vol. 2, Book 20, Hadith 1625