Sahih
Muslim
صحيح مسلم
05
The Book of Mosques and Places of Prayer
كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
Chapter 30: The one who catches up with a rak`ah of the prayer, he has caught up with that prayer
باب مَنْ أَدْرَكَ رَكْعَةً مِنَ الصَّلاَةِ فَقَدْ أَدْرَكَ تِلْكَ الصَّلاَةَ
Sahih Muslim 608 d
This hadith has been reported by Ma'mar with another chain of transmitters.
وَحَدَّثَنَاهُ عَبْدُ الأَعْلَى بْنُ حَمَّادٍ، حَدَّثَنَا مُعْتَمِرٌ، قَالَ سَمِعْتُ مَعْمَرًا، بِهَذَا الإِسْنَادِ .
Grade: Sahih