It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "When one of you comes to the Friday prayer, let him take a ritual bath (ghusl)."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1397