Exodus 27:20,21
And you shall command the children of Israel, that they bring you pure oil olive beaten for the light, to cause the lamp to burn always.
Torrey's Topical Textbook—AKJV

Leviticus 24:3,4
Without the veil of the testimony, in the tabernacle of the congregation, shall Aaron order it from the evening to the morning before the LORD continually: it shall be a statute for ever in your generations.
Torrey's Topical Textbook—AKJV