Musannaf Ibn Abi Shaybah 20716 — Military campaigning: is it

Dawud (may Allah have mercy on him) says: I said to Sa'id bin al-Musayyib (may Allah have mercy on him): I know that jihad is obligatory upon all people. Hearing this, he remained silent. I knew that if he disagreed with what I said, he would certainly have made it clear. Then I said to Sa'id bin al-Musayyib (may Allah have mercy on him): I prepared myself for jihad, with nothing driving me but that, until I did frontier duty (ribat). (Is that enough?) He said: It has sufficed for you.