Yahya bin Wathab says that I asked Sayyiduna Ibn Umar (may Allah be pleased with them both) about the Ghusl (ritual bath) of Jumu'ah: so he replied that the Prophet (peace and blessings be upon him) commanded us regarding it.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5078