Musannaf Ibn Abi Shaybah 20638 — What is mentioned on the virtue

Aslam (may Allah have mercy on him) said: When Sayyiduna Abu Ubaydah (may Allah be pleased with him) came to Syria, he and his companions were besieged, and at that time they suffered severe hardship. In this hour of difficulty he wrote to Sayyiduna Umar (may Allah be pleased with him) for help. Sayyiduna Umar (may Allah be pleased with him) replied to the letter in these words: "To proceed: Allah Almighty has placed ease after every hardship, and one hardship can never overcome two eases." Sayyiduna Umar (may Allah be pleased with him) also wrote this verse to Sayyiduna Abu Ubaydah (may Allah be pleased with him): "O you who believe! Be patient, outdo one another in patience, remain stationed at the frontiers, and fear Allah so that you may succeed." [Al Imran: 200]
Sayyiduna Abu Ubaydah (may Allah be pleased with him) then wrote back to Sayyiduna Umar (may Allah be pleased with him), writing this verse: "Know that the life of this world is but play, amusement, adornment, boasting among yourselves, and rivalry in wealth and children." [Al-Hadid: 20]
Sayyiduna Umar (may Allah be pleased with him) read this letter of Sayyiduna Abu Ubaydah (may Allah be pleased with him) out to the people and then said: "O people of Madinah! Abu Ubaydah (may Allah be pleased with him) is calling you to jihad." Aslam said: I was standing in the market when I saw some people in white clothing coming down from the mountain pass; among them was Sayyiduna Hudhayfah bin al-Yaman (may Allah be pleased with him). They were giving people the good news of victory. Overjoyed, I went to Sayyiduna Umar (may Allah be pleased with him) and said: "O Commander of the Believers! Glad tidings of victory!" Sayyiduna Umar (may Allah be pleased with him) proclaimed "Allahu Akbar" and said: "How many will say: 'If only it had been Khalid bin al-Walid!'"