A freed slave of the family of al-Zubayr (may Allah be pleased with him) narrates, attributing it to the Prophet (peace and blessings be upon him), that he said: "The Friday prayer is obligatory upon every adult except a child, a slave, a woman and a sick person."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5635