Sahih al-Bukhari 638
Sahih al-Bukhari · Book 10: Call to Prayers (Adhaan) · One should not stand for As-Salat (the prayer) hurriedly but with calmness and solemnity.
Narrated `Abdullah bin Abi Qatada:
حَدَّثَنَا أَبُو نُعَيْمٍ ، قَالَ حَدَّثَنَا شَيْبَانُ ، عَنْ يَحْيَى ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي قَتَادَةَ ، عَنْ أَبِيهِ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " إِذَا أُقِيمَتِ الصَّلاَةُ فَلاَ تَقُومُوا حَتَّى تَرَوْنِي وَعَلَيْكُمْ بِالسَّكِينَةِ " . تَابَعَهُ عَلِيُّ بْنُ الْمُبَارَكِ .
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) and do it calmly.' "