وَعَنْ عَلَيٍّ رضى الله عنه
قَالَ: «كَانَ لِي مَعَ رَسُولِ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَدْخَلَانِ، فَكُنْتُ إِذَا أَتَيْتُهُ وَهُوَ يُصَلِّي تَنَحْنَحَ لِي»
“I had the permission of the Messenger of Allah (sallallahu alayhi wa sallam) to see him in his house at two times, and whenever I entered to him while he was praying he would clear his throat as a sign to me.”.
Bulugh al-Maram 266, Book 2, The Book of Prayer, Hadith 87. 1 min read