When any one of you observes the Jumu'a prayer (two obligatory rak'ahs in congregation), he should observe four (rak'ahs) afterwards.
Sahih Muslim Book 7, Hadith 86
← Previous Hadith " Alif-Lam-Mim, Tanzil" in the first rak'ah, and in the second one:" Surely there came over the man a time when he was nothing that could be mentioned."

Sahih Muslim Book 7, Hadith 85 Next Hadith → When you observe prayer after (the two obligatory rak'ahs) of Jumu'ah, you should observe four rak'ahs (and 'Amr in his narration has made this addition that Ibn Idris said this on the authority of Suhail): And if you are in a hurry on account of something, you should observe two rak'ahs in the mosque and two when you return (to your house).

Sahih Muslim Book 7, Hadith 87