سنن النسائي

It was narrated that Anas said: "The Messenger of Allah (ﷺ) was leading us in prayer when a man came and entered the masjid, and he was out of breath. He said: 'Allahu Akbar, al-hamdulillahi hamdan kathiran tayiban mubarakan fih. (Allah is Most Great, praise be to Allah, much good and blessed praise.)' When the Messenger of Allah (ﷺ) had finished his prayer he said: 'Which of you is the one who spoke these words?' The people kept quiet. He said: 'He did not say anything bad.' The man said: 'I did, O Messenger of Allah. I came and I was out of breath, and I said it.' The Prophet (ﷺ) said: 'I saw twelve angels rushing to see which of them would take it up.'"