It was narrated that 'Amr bin Dinar said:

"I heard Jabir bin 'Abdullah say: 'The Messenger of Allah ﷺ said: "If any one of you comes and the imam has appeared, let him pray two rak'ahs. Shu'bah (one of the narrators) said: "On Friday."

أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ دِينَارٍ، قَالَ سَمِعْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ، يَقُولُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " إِذَا جَاءَ أَحَدُكُمْ وَقَدْ خَرَجَ الإِمَامُ فَلْيُصَلِّ رَكْعَتَيْنِ " . قَالَ شُعْبَةُ يَوْمَ الْجُمُعَةِ .