Musannaf Ibn Abi Shaybah 20611 — What is mentioned on the virtue

Sayyiduna Abu Umamah (may Allah be pleased with him) and Jubayr bin Nufayr (may Allah have mercy on him) said: "A time will come upon people in which the best jihad will be ribat (guarding the frontiers)." The narrator says: I asked: "When will that be?" They said: "When campaigns become few, penalties become many, and the spoils of war come to be treated as lawful, then at that time the best jihad is ribat."