Exodus 27:21

27:21 In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before Yahweh: it shall be a statute forever throughout their generations on the behalf of the children of Israel.
-World English Bible

Other Translation

27:21 In the tabernacle of the congregation without the vail, which [is] before the testimony, Aaron and his sons shall order it from evening to morning before the LORD: [it shall be] a statute for ever unto their generations on the behalf of the children of Israel.
-King James Version