question #3 Sahih Muslim 600, Book 5, Hadith 192 : What can be learned about the acceptance of spontaneous supplications during prayer from this event?

A man came panting and entered the row of worshippers and said: Praise be to Allah, much praised and blessed. When the Messenger of Allah (ﷺ) finished the prayer he said: Who amongst you uttered these words? The people remained silent. He (the Prophet again said) -: Who amongst you uttered these words? He said nothing wrong. Then a man said: I came and had a difficulty in breathing, so I uttered them. He replied: I saw twelve angels facing one another as to who will take them up (to Allah).