Exodus 28:15-29 gives the detailed instructions for the breastpiece that Aaron now puts on in Leviticus 8:8.

Exodus 28:30 commands placing Urim and Thummim in the breastpiece — this verse fulfills that instruction.

Exodus 39:8-21 records the actual construction of the breastpiece, which Aaron now wears as commanded.

Ezra 2:63 later references the Urim and Thummim for divine guidance — the same objects placed here.

Exodus 29:5 commands putting the breastpiece on Aaron — this verse is the execution of that command.

Numbers 27:21 describes inquiring by the Urim — the same divine lot placed here is used for guidance.

Deuteronomy 33:8 connects the Urim and Thummim given to Levi, showing the priestly possession of these oracular objects from the beginning.

Exodus 28:4 lists the breastpiece among priestly garments — a broader description of what is being put on.