The Book of the Times (of Prayer)
6/30. Chapter:
Whoever Catches Up With A Rak'ah Of The Prayer
Sunan an-Nasai
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ إِدْرِيسَ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ، عَنِ الزُّهْرِيِّ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " مَنْ أَدْرَكَ مِنَ الصَّلاَةِ رَكْعَةً فَقَدْ أَدْرَكَهَا " .
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 it."
Reference : Sunan an-Nasa'i 554In-book reference : Book 6, Hadith 61English translation : Vol. 1, Book 6, Hadith 555