Exodus 27:20

Overview - Exodus 27
The altar of burnt offering, with the vessels thereof.
The court of the tabernacle inclosed with hangings and pillars.
18 The measure of the court, and the furniture of brass.
20 The oil for the lamp.
Treasury of Scripture Knowledge

Exodus 27:20  (King James Version)
And thou shalt command the children of Israel, that they bring thee pure oil olive beaten for the light, to cause the lamp to burn always.

pure oil olive beaten
That is, such oil as could be easily expressed from the olives, after they had been bruised in a mortar; and which is much purer than that obtained after the olives are put under the press.
39:37 Leviticus 24:2-4 ; Judges 9:9 ; Psalms 23:5 ; Zechariah 4:11-14 ; Revelation 11:4

for the light

to cause the lamp
Josephus says, that the whole of the seven lamps burned all night; and that in the morning four were extinguished, and three burned the whole of the day. Such might have been the practice in his time; but it appears sufficiently evident from ch. 30:8 and 1 ; Sa 3:3 that they were anciently extinguished in the morning.

to burn
Hebrew to ascend up.