بُلُوغُ الْمَرَامِ
Bulugh al-Maram 460
The Book of Prayer
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ إِذَا صَلَّى أَحَدُكُمُ الْجُمُعَةَ فَلْيُصَلِّ بَعْدَهَا أَرْبَعًا } رَوَاهُ مُسْلِم ٌ [1] .
Narrated Abu Hurairah (RA): Allah's Messenger (ﷺ) said: "When anyone of you prays the Jumu'ah prayer, he should pray four (optional) Rak'at after it." [Reported by Muslim].
Sunnah.com reference: Book 2, Hadith 380