The Book of the Commencement of the Prayer
11/14. Chapter:
The Imam pausing after starting the prayer
Sunan an-Nasai
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا وَكِيعٌ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عُمَارَةَ بْنِ الْقَعْقَاعِ، عَنْ أَبِي زُرْعَةَ بْنِ عَمْرِو بْنِ جَرِيرٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَتْ لَهُ سَكْتَةٌ إِذَا افْتَتَحَ الصَّلاَةَ .
It was narrated from Abu Hurairah that: The Messenger of Allah (ﷺ) used to pause briefly when he had started to pray.
Reference : Sunan an-Nasa'i 894In-book reference : Book 11, Hadith 19English translation : Vol. 2, Book 11, Hadith 895