(29) باب مَنْ أَدْرَكَ مِنَ الصَّلاَةِ رَكْعَةً
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "Whoever could get one rak`a of a prayer, (in its proper time) he has got the prayer."
Reference: Sahih al-Bukhari 580
In-book reference: Book 9, Hadith 56
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 10, Hadith 554