(174) باب التَّأْمِينِ وَرَاءَ الإِمَامِ
Wail b, hujr said that he prayed behind the Messenger of Allah (ﷺ),and he said Amin loudly and saluted at his right and left sides until I saw the whiteness of his cheek. (FR)
Reference (FR): Sunan Abi Dawud 933 (FR)
In-book reference (FR): Book 2, Hadith 544 (FR)
English translation (FR): Book 2, Hadith 933 (FR)