بُلُوغُ الْمَرَامِ
Bulugh al-Maram 462
The Book of Prayer
وَعَنْ أَبِي هُرَيْرَةَ - رضى الله عنه - قَالَ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -{ مَنِ اغْتَسَلَ, ثُمَّ أَتَى الْجُمُعَةَ, فَصَلَّى مَا قُدِّرَ لَهُ, ثُمَّ أَنْصَتَ, حَتَّى يَفْرُغَ اَلْإِمَامُ مِنْ خُطْبَتِهِ, ثُمَّ يُصَلِّي مَعَهُ: غُفِرَ لَهُ مَا بَيْنَهُ وَبَيْنَ الْجُمُعَةِ اَلْأُخْرَى, وَفَضْلُ ثَلَاثَةِ أَيَّامٍ } رَوَاهُ مُسْلِم ٌ [1] .
Narrated Abu Hurairah (RA): Allah's Messenger (ﷺ) said: "Whoever takes a bath, then comes to al-Jumu'ah prayer, then prays what was fixed for him, then keeps silent till the Imam finishes the Khutbah (religious talk - sermon), and then prays along with him - his sins (committed) between that time and the next Friday will be forgiven, with an addition of three days more." [Reported by Muslim].
Sunnah.com reference: Book 2, Hadith 382