Exodus 30:6

Place the altar in front of the veil that is before the ark of the Testimony—before the mercy seat that is over the Testimony—where I will meet with you.

Note That is, the ark of the covenant; also in verse 26

BSB · Berean Standard Bible
And thou shalt put it before the vail that is by the ark of the testimony, before the mercy seat that is over the testimony, where I will meet with thee.
KJV · King James Version
You shall put it before the veil that is by the ark of the covenant, before the mercy seat that is over the covenant, where I will meet with you.
WEB · World English Bible
And thou shalt put it before the veil that is by the ark of the testimony, before the mercy-seat that is over the testimony, where I will meet with thee.
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

vail
Exodus 26:31–35; Exodus 40:3, 5, 26; Matthew 27:51; Hebrews 9:3, 4
before the mercy seat that is over the testimony
The words [lpny hkprt ashr `l h`dt,] {liphney haccapporeth asher âl haaiduth,} "before the mercy-seat that is over the testimony," are thought to be a repetition of the preceding clause, [lpn` hprkt 'sha `l 'rn h`dt,] {liphney happarocheth asher âl aron haaiduth,} "before the vail that is by the ark of the testimony; the word [hprkt,] ,] {happarocheth,} "the vail," being corrupted, by transposing the letters into [hkprt,] ,] {hacapporeth,} "the mercy-seat," and the word ['rn,] ,] {aron,} "ark," omitted. This repetition, as Dr. Kennicott observes, places the altar of incense before the mercy-seat, and consequently in the Holy of Holies! Now this could not be, as the altar of incense was attended every day, and the Holy of Holies entered only once in the year. The five words which appear to be a repetition are wanting in twenty-six of Kennicott's and Rossi's MSS. and in the Samaritan Text.
Exodus 25:21, 22; Leviticus 16:13; 1 Chronicles 28:11; Hebrews 4:16; Hebrews 9:5
I will
Exodus 30:36; Exodus 29:42, 43; Numbers 17:4