The Book of the Times (of Prayer)
6/30. Chapter:
Whoever Catches Up With A Rak'ah Of The Prayer
Sunan an-Nasai
أَخْبَرَنِي شُعَيْبُ بْنُ شُعَيْبِ بْنِ إِسْحَاقَ، قَالَ حَدَّثَنَا أَبُو الْمُغِيرَةِ، قَالَ حَدَّثَنَا الأَوْزَاعِيُّ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ أَدْرَكَ مِنَ الصَّلاَةِ رَكْعَةً فَقَدْ أَدْرَكَهَا " .
It was narrated that Abu Hurairah said: "The Messenger of Allah (ﷺ) said: 'Whoever catches up with a Rak'ah of the prayer has caught up with it."
Reference : Sunan an-Nasa'i 556In-book reference : Book 6, Hadith 63English translation : Vol. 1, Book 6, Hadith 557