Tirmidhi

1:
The sum total of all this is that among the students of Aswad, only Abu Ishaq Sabi'i narrated this hadith with the wording ((كَانَ النَّبِيُّ ﷺ يَنَامُ وَهُوَ جُنُبٌ لَايَمَسُّ مَاءً)) ("The Prophet ﷺ would sleep while in a state of major ritual impurity (junub) without touching water"), whereas his other students narrated it with the wording ((إِنَّهُ كَانَ يَتَوَضَّأُ قَبْلَ أَنْ يَّنَامَ)) ("Indeed, he would perform ablution (wudu) before sleeping"). However, the addition of a word by a trustworthy (thiqa) narrator, as long as it does not contradict, does not prevent the hadith from being authentic. And Abu Ishaq Sabi'i is a trustworthy narrator. Furthermore, in one narration of Ahmad (6/102), there is explicit mention of hearing it from Aswad. Also, Sufyan Thawri narrated this from Abu Ishaq Sabi'i, and the narration of Sufyan Thawri from Abu Ishaq Sabi'i is considered the most reliable (see Sahih Abu Dawud, no. 234, and Sunan Ibn Majah, no. 583).