سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 553
The Book of the Times (of Prayer)
Whoever Catches Up With A Rak'ah Of The Prayer
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، . أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ مَنْ أَدْرَكَ مِنَ الصَّلاَةِ رَكْعَةً فَقَدْ أَدْرَكَ الصَّلاَةَ .
It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) said: "Whoever catches up with a Rak'ah of the prayer, then he has caught up with the prayer."
Sunan an-Nasa'i, 553Sahih (Darussalam)