1235. hadíth
وَ رَوَى اَلْحَلَبِيُّ عَنْهُ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «إِذَا أَدْرَكْتَ اَلْإِمَامَ قَبْلَ أَنْ يَرْكَعَ اَلرَّكْعَةَ اَلْأَخِيرَةَ فَقَدْ أَدْرَكْتَ اَلصَّلاَةَ وَ إِنْ أَدْرَكْتَهُ بَعْدَ مَا رَكَعَ فَهِيَ أَرْبَعٌ بِمَنْزِلَةِ اَلظُّهْرِ.
Al-Halabi narrated from Imam (a.s) who said: "If you join the Imam before he bows in the last rak'ah, you have caught the (Jumu’ah) prayer. But if you join him after he has bowed, then it is considered as four rak'ahs, like the Dhuhr prayer."