It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that I heard the Prophet (peace and blessings be upon him) saying from the pulpit: When any person comes for Jumu'ah, he should come after performing ghusl (ritual bath).
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5008