وَعَنِ ابْنِ عُمَرَ
قَالَ: قَالَ رَسُولُ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ -«مَنْ أَدْرَكَ رَكْعَةً مِنْ صَلَاةِ اَلْجُمُعَةِ وَغَيْرِهَا فَلْيُضِفْ إِلَيْهَا أُخْرَى، وَقَدْ تَمَّتْ صَلَاتُهُ»
The Messenger of Allah (sallallahu alayhi wa sallam) said: “Whoever is in time for a Rakah of the Friday prayer, or any other prayer, should add another (Rakah) to it and his prayer will then be complete.”.
Bulugh al-Maram 541, Book 2, The Book of Prayer, Hadith 362. 1 min read