Musannaf Ibn Abi Shaybah 10019 — Fasting Rajab and what has come

Kharashah bin al-Hurr says: I saw Sayyiduna Umar (may Allah be pleased with him) striking people's hands in Rajab until they put their hands into the dishes to eat. He would say: "Eat, for this is a month that the people of the Jahiliyyah (pre-Islamic ignorance) used to venerate."