Sunan Abi Dawud Book 2, Hadith 373
A man came panting to join the row of worshippers, and said: Allah is most great; praise be to Allah, much praise, good and blessed. When the Messenger of Allah(ﷺ) finished his prayer, he asked: Which of you is the one who spoke the words? He said nothing wrong. Then the man said: I (said), Messenger of Allah (ﷺ); I came and had difficulty in breathing, so I said them. He said: I saw twelve angels racing against one another to be the one to take them to Allah.
The narrator Humaid added: When any of you comes for praying, he should walk as usual (i.e. he should not hasten and run quickly); then he should pray as much as he finds it (along with the imam), and should offer the part of the prayer himself (when the prayer is finished) which the Imam had offered before him.
Ibn al-Munkadir, Ibn Abi Farwah and a number of jurists of Madina said to me: When you recite the supplication “I am first of the Muslims,” say instead; “I am one of the Muslims”.
Jabir saw the Messenger of Allah (ﷺ) observing prayer. (The narrator Amr said: I do not know which prayer he was offering.)
He (the Prophet) said: Allah is altogether great; Allah is altogether great; Allah is altogether great; and praise be to Allah in abundance; and praise be to Allah is abundance; and praise be to Allah in abundance. Glory be to Allah in the morning and after (saying it three times). I seek refuge in Allah from the accursed devil, from his puffing up (nafkh), his spitting (nafth) and his evil suggestion (hamz).
He (Amr) said: His nafth it poetry, his nafkh is pride, and his hamz is madness.