The term 'jishu時衆' originated from the sentence that '道俗時衆等、各發無上心 (all priests and all people who live within the times could have the superior mind)' in 'Kammuryoju-kyosho' (Commentary on the Meditation Sutra) by Shandao.
時衆とは善導の「観無量寿経疏」の一節「道俗時衆等、各發無上心」からきている。