(17) باب التَّنَحْنُحِ فِي الصَّلاَةِ
'Abdullah bin Nujayy narrated that his father said:
"Ali said to me: 'I was so close to the Messenger of Allah (ﷺ), closer than anyone else. I used to come to him at the end of every night, before dawn, and say: "As-salamu 'alayka ya Nabiyy Allah (Peace be upon you, O Prophet of Allah)." If he cleared his throat I would go back to my family, otherwise I would enter upon him.'"
Reference: Sunan an-Nasa'i 1213
In-book reference: Book 13, Hadith 35
English translation: Vol. 2, Book 13, Hadith 1214