Further evidence of the book's date is in the fact that Daniel is excluded from the Hebrew Bible's canon of the prophets, which was closed around 200 BC, and the Wisdom of Sirach, a work dating from around 180 BC, draws on almost every book of the Old Testament except Daniel, leading scholars to suppose that its author was unaware of it. Daniel is, however, quoted in a section of the Sibylline Oracles commonly dated to the middle of the 2nd century BC, and was popular at Qumran at much the same time, suggesting that it was known from the middle of that century.[42]