(18) باب الصَّلاَةِ بَعْدَ الْجُمُعَةِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
When any one amongst you observes prayer after Jumu'a, he should observe four rak'ahs. (In the hadith transmitted by Jarir the word minkum is not recorded.)
Reference: Sahih Muslim 881 c
In-book reference: Book 7, Hadith 88
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1917