If anyone obtains a rak'ah in the prayer (along with the imam), he has obtained the whole prayer.
Sunan Abi Dawud Book 2, Hadith 732
← Previous Hadith I saw the Apostle (ﷺ) would descend from the pulpit and a man stop him for his need. He would remain standing with him until his need was fulfilled. Then he would stand and pray.

Abu Dawud said: This tradition is not well known from the narrator Thabit. Jarir b. Hazim is the only narrator of this tradition.

Sunan Abi Dawud Book 2, Hadith 731 Next Hadith → The Messenger of Allah (ﷺ) used to recite at the two 'Ids (festivals) and on Friday, "Glorify the name of your most high Lord." (87) and "Has the story of the overwhelming reached you?" (88) He said: When a festival ('Id) and a Friday coincided, he recited them both (at the two prayers).

Sunan Abi Dawud Book 2, Hadith 733