Questioner: O Shaikh of ours! Actually I don’t remember (maybe it’s in) the hadith about, ‘The One who Prayed Badly,’ that in some of its paths of narration, he ﷺ said, “When you stand to pray, then give the call to prayer, then stand, then say, ‘Allaahu Akbar.’”
Al-Albaani: Yes, this is in Sunan Abu Dawud, authenticated.
Questioner: And it is authentic?
Questioner: And this is something which confirms that the adhaan is prescribed for the person who prays alone and the one who doesn’t [pray alone but prays in a Jamaa’ah]?
Al-Hudaa wan-Noor, 179.