It was narrated that Ali said: "I had two times of visiting the Messenger of Allah(ﷺ), at night and during the day. If I came to him when he was praying, he would clear his throat (to let me know he was praying)"
DaifDaifDaifBook 33 · Hadith 52
سنن ابن ماجه
It was narrated that Ali said: "I had two times of visiting the Messenger of Allah(ﷺ), at night and during the day. If I came to him when he was praying, he would clear his throat (to let me know he was praying)"