It is narrated from Sayyiduna Salman (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "O Salman! Do you know what Jumu'ah is? On it your father Adam (peace be upon him) was gathered." And the Messenger of Allah (peace and blessings be upon him) said: "Whoever takes a ritual bath (ghusl) on the day of Jumu'ah, then comes to the mosque, will be forgiven, or it will be an expiation for him."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6067