Musannaf Ibn Abi Shaybah 20610 — What is mentioned on the virtue

Umar bin Abdullah, the freed slave of Ghufrah (may Allah have mercy on him), said: "A son of Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) spent thirty days on jihad. When he came back, Sayyiduna Ibn Umar (may Allah be pleased with them both) said to him: 'I adjure you to go back and spend ten more days on jihad so that forty days are completed.'"