1 Kings 8:21
And I have set there a place for the ark, wherein is the covenant of the Lord, which he made with our fathers, when he brought them out of the land of Egypt.
Cross-reference
1 Kings 8:6 narrates the actual placement of the ark in the Most Holy Place, detailing what this verse summarizes.
1 Kings 8:9 specifies the ark's contents—the two stone tablets—clarifying what 'the covenant of the Lord' refers to.
Exodus 34:28 records Moses writing the Ten Commandments on tablets, the very covenant tablets placed in the ark here.
Deuteronomy 9:9 recounts Moses receiving the stone tablets of the covenant on Sinai, which Solomon later places inside the ark.
Deuteronomy 9:11 similarly describes God giving Moses the two tablets of the covenant—the same tablets now in the ark.
1 Chronicles 22:19 records David's charge to build the temple and bring the ark—the very event Solomon is now completing.
2 Chronicles 6:11 parallels this verse almost verbatim, confirming Solomon placed the ark containing the covenant in the temple.
Hebrews 9:4 adds that the ark also contained manna and Aaron's rod, enriching the description of what was inside.
Deuteronomy 31:26 places the Book of the Law beside the ark—an additional item near the covenant tablets referenced here.