New Revised Standard Version
The LORD said to Moses: Tell your brother Aaron not to come just at any time into the sanctuary inside the curtain before the mercy seat that is upon the ark, or he will die; for I appear in the cloud upon the mercy seat.

New American Bible
and said to him: Tell your brother Aaron that he is not to come whenever he pleases into the inner sanctuary, inside the veil, in front of the cover on the ark, lest he die, for I reveal myself in a cloud above the ark’s cover.

Douay-Rheims Bible
And he commanded him, saying: Speak to Aaron thy brother, that he enter not at all into the sanctuary, which is within the veil before the propitiatory, with which the ark is covered, lest he die, (for I will appear in a cloud over the oracle),

And he commanded him, saying: Speak to Aaron thy brother, that he enter not at all into the sanctuary, which is within the veil before the propitiatory, with which the ark is covered, lest he die, (for I will appear in a cloud over the oracle),

he come not

Leviticus 23:27 Upon the tenth day of this seventh month shall be the day of atonement. It shall be most solemn, and shall be called holy: and you shall await your souls on that day, and shall offer a holocaust to the Lord.

Exodus 26:33,34 And the veil shall be hanged on with rings, and within it thou shalt put the ark of the testimony, and the sanctuary and the holy of the holies shall be divided with it. . . .

Exodus 30:10 And Aaron shall pray upon the horns thereof once a year, with the blood of that which was offered for sin; and shall make atonement upon it in your generations. It shall be most holy to the Lord.

Exodus 40:20,21 And he put the testimony in the ark, thrusting bars underneath, and the oracle above. . . .

1 Kings 8:6 And the priests brought in the ark of the covenant of the Lord into its place, into the oracle of the temple, into the holy of holies, under the wings of the cherubims.

Hebrews 9:3,7,8 And after the second veil, the tabernacle which is called the Holy of Holies: . . .

Hebrews 10:19,20 Having therefore, brethren, a confidence in the entering into the holies by the blood of Christ: . . .

that he die not

Leviticus 16:13 That when the perfumes are put upon the fire, the cloud and vapour thereof may cover the oracle, which is over the testimony, and he may not die.

Leviticus 8:35 Day and night shall you remain in the tabernacle observing the watches of the Lord, lest you die. For so it hath been commanded me.

Numbers 4:19 But do this to them, that they may live, and not die, by touching the holies of holies. Aaron and his sons shall go in, and they shall appoint every man his work, and shall divide the burdens that every man is to carry.

Numbers 17:10 And the Lord said to Moses: Carry back the rod of Aaron into the tabernacle of the testimony, that it may be kept there for a token of the rebellious children of Israel, and that their complaints may cease from me lest they die.

Matthew 27:51 And behold the veil of the temple was rent in two from the top even to the bottom: and the earth quaked and the rocks were rent.

Hebrews 4:14-16 Having therefore a great high priest that hath passed into the heavens, Jesus the Son of God: let us hold fast our confession. . . .

Hebrews 10:19 Having therefore, brethren, a confidence in the entering into the holies by the blood of Christ:

in the cloud

Exodus 40:34,35 The cloud covered the tabernacle of the testimony, and the glory of the Lord filled it. . . .

1 Kings 8:10-12 And it came to pass, when the priests were come out of the sanctuary, that a cloud filled the house of the Lord, . . .

2 Chronicles 5:14 Nor could the priests stand and minister by reason of the cloud. For the glory of the Lord had filled the house of God.

the mercy seat

Exodus 25:17-22 Thou shalt make also a propitiatory of the purest gold: the length thereof shall be two cubits and a half, and the breadth a cubit and a half. . . .