(30) باب مَنْ أَدْرَكَ رَكْعَةً مِنَ الصَّلاَةِ فَقَدْ أَدْرَكَ تِلْكَ الصَّلاَةَ
Abu Huraira reported the Messenger of Allah (ﷺ) as saying:
He who finds one rak'ah of the prayer with the Imam, he in fact finds the prayer. (IT)
Reference (IT): Sahih Muslim 607 b (IT)
In-book reference (IT): Book 5, Hadith 206 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1261 (IT)