Nafi' narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the ritual bath (ghusl) is upon the one on whom the Friday prayer is obligatory, and the Friday prayer is obligatory upon the one who can return to his family (by nightfall).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5598