The veil of the testimony, i.e. which was before the ark of the testimony. Shall Aaron order it; either by himself, or by his sons, Exodus 25:37.
Related Commentaries of Leviticus 24:3
Leviticus 24:3
3 Without the vail of the testimony, in the tabernacle of the congregation, shall Aaron order it from the evening unto the morning before the LORD continually: it shall be a statute for ever in your generations.