When any one of you observes the Jumu'a prayer (two obligatory rak'ahs in congregation), he should observe four (rak'ahs) afterwards. (Using translation from Muslim 881a)  

قَالَ رَسُولُ اللهِ ﷺ «إِذَا صَلَّى أَحَدُكُمُ الْجُمُعَةَ فَلْيُصَلِّ بَعْدَهَا أَرْبَعًا»  

It was narrated from Salim, from his father, that the Prophet ﷺ used to pray two Rak’ah after Jumu’ah. (Using translation from Ibn Mājah 1131)  

أَنَّ رَسُولَ اللهِ ﷺ «كَانَ يُصَلِّي بَعْدَ الْجُمُعَةِ رَكْعَتَيْنِ»  

The Messenger of Allah ﷺ would not pray after Jumu'ah until he had left, then he would pray two rak'ahs. (Sahih) (Using translation from Nasāʾī 1427)  

أَنَّ رَسُولَ اللهِ ﷺ «كَانَ لَا يُصَلِّي بَعْدَ الْجُمُعَةِ حَتَّى يَنْصَرِفَ فَيُصَلِّي رَكْعَتَيْنِ»  

“The Messenger of Allah ﷺ used to do that.” (Using translation from Ibn Mājah 1130)  

أَنَّهُ كَانَ إِذَا صَلَّى الْجُمُعَةَ انْصَرَفَ فَصَلَّى سَجْدَتَيْنِ فِي بَيْتَهُ ثُمَّ قَالَ كَانَ رَسُولُ اللهِ ﷺ يَصْنَعُ ذَلِكَ  

"The Messenger of Allah ﷺ used to do this." (Using translation from Nasāʾī 1429)  

أَنَّهُ كَانَ يُصَلِّي بَعْدَ الْجُمُعَةِ رَكْعَتَيْنِ يُطِيلُ فِيهِمَا وَيَقُولُ كَانَ رَسُولُ اللهِ ﷺ يَفْعَلُهُ