And when I looked, behold, an hand [was] sent unto me,.... Not of an angel, but of Christ himself, in a visionary way; for this was not a real hand, but the likeness of one, as in Eze 8:3; and so the Targum here,"and I saw, and behold, the likeness of a hand stretched out on the side to me.'
'This symbol was to show that his prophecy, that he was sent to deliver, was from heaven and came from Christ; and that hand that delivered it to him would protect and defend him:and, lo a roll of a book [was] therein; held in it, and held forth by it, to the prophet.
Books were frequently written on parchment or vellum, and rolled about a stick, in form of a cylinder; and hence they were called volumes or rolls, Ps 40:7.