Al-Zuhri (may Allah have mercy on him) narrates from Umm Abdullah al-Dawsiyyah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "Even if there are only four people in a village, the Friday prayer is obligatory upon them."
Al-Daraqutni said: This is not authentic from al-Zuhri; everyone who narrated it from him is matruk (abandoned), and al-Zuhri's hearing from al-Dawsiyyah is not established.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5616