حَدَّثَنَا الْقَعْنَبِيُّ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنْ أَدْرَكَ رَكْعَةً مِنَ الصَّلاَةِ فَقَدْ أَدْرَكَ الصَّلاَةَ ‏"‏ ‏.‏

Abu Hurairah reported the Messenger of Allah (PBUH) as saying: If anyone obtains a rak'ah in the prayer (along with the imam), he has obtained the whole prayer. Translation Not Available

Book Ref: Sunan Abi Dawud Book 2 Hadith 1121
Web Ref:  Sunan Abi Dawud Book 2 Hadith 1116