It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Every prophet before me was given seven companions, nobles, and ministers, whereas I have been given fourteen, among whom are Abu Bakr as-Siddiq, Umar al-Faruq, Abdullah ibn Mas'ud, and Ammar (may Allah be pleased with them all)."
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 1274