20, 21. pure oil olive beaten—that is, such as runs from the olives when bruised and without the application of fire.

     21. shall order it from evening to morning—The tabernacle having no windows, the lamps required to be lighted during the day. JOSEPHUS says that in his time only three were lighted; but his were degenerate times, and there is no Scripture authority for this limitation. But although the priests were obliged from necessity to light them by day, they might have let them go out at night had it not been for this express ordinance.