The Book of Jumu'ah (Friday Prayer)
14/43. Chapter:
The Imam's Prayer After Jumu'ah
Sunan an-Nasai
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ لاَ يُصَلِّي بَعْدَ الْجُمُعَةِ حَتَّى يَنْصَرِفَ فَيُصَلِّيَ رَكْعَتَيْنِ .
It was narrated from Ibn 'Umar that: The Messenger of Allah (ﷺ) would not pray after Jumu'ah until he had left, then he would pray two rak'ahs. (Sahih)
Reference : Sunan an-Nasa'i 1427In-book reference : Book 14, Hadith 64English translation : Vol. 2, Book 14, Hadith 1428