Exodus 25:21

21And you shall put the mercy seat on the top of the ark, and in the ark you shall put the testimony that I shall give you.

Exodus 38:21

Materials for the Tabernacle

21These are the records of the tabernacle, athe tabernacle of the testimony, as they were recorded at the commandment of Moses, the responsibility of the Levites bunder the direction of Ithamar the son of Aaron the priest.

Numbers 1:53

53But the Levites shall camp around the tabernacle of the testimony, so that there may be no cwrath on the congregation of the people of Israel. dAnd the Levites shall keep guard over the tabernacle of the testimony.”

Hebrews 9:4

4having the golden ealtar of incense and fthe ark of the covenant covered on all sides with gold, in which was ga golden urn holding the manna, and hAaron’s staff that budded, and ithe tablets of the covenant.
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