Sahih al-Bukhari Book 10, Hadith 33
The Prophet (ﷺ) said, "When you hear the Iqama, proceed to offer the prayer with calmness and solemnity
and do not make haste. And pray whatever you are able to pray and complete whatever you have
missed.
My father said, "While we were praying with the Prophet (ﷺ) he heard the noise of some people. After the prayer he said, 'What is the matter?' They replied 'We were hurrying for the prayer.' He said, 'Do not make haste for the prayer, and whenever you come for the prayer, you should come with calmness, and pray whatever you get (with the people) and complete the rest which you have missed."
My father said. "Allah's Messenger (ﷺ) said, 'If the Iqama is pronounced then do not stand for the prayer till you see me (in front of you).' "