Exodus 28:12
And thou shalt put the two stones upon the shoulders of the ephod for stones of memorial unto the children of Israel: and Aaron shall bear their names before the Lord upon his two shoulders for a memorial.
Cross-reference
Exodus 28:7 describes the shoulder pieces of the ephod, which are the exact location where the remembrance stones are set in verse 12.
In Exodus 28:29, Aaron also bears Israel's names on the breastpiece over his heart—a parallel memorial, but on a different part of the vestments.
Exodus 39:6 records the actual engraving of the onyx stones as commanded here, showing the execution of the same instruction.
Exodus 39:7 describes placing the stones on the shoulder pieces—directly fulfilling the memorial purpose commanded in this verse.
In Hebrews 7:25-28, Christ's perpetual intercession as high priest fulfills the memorial function of the shoulder stones—He always bears His people before God.
Hebrews 9:24 shows Christ entering heaven to appear for us — a typological fulfillment of the high priest bearing Israel's names before God.
Numbers 16:40 uses the censers of Korah as a 'memorial' of judgment—a contrasting memorial to the stones' positive intercession for Israel.
Joshua 4:7 also uses stones as a memorial for Israel's tribes — a physical reminder similar to the onyx stones here.
Zechariah 6:14 speaks of a crown placed as a reminder in the temple — similar function to Aaron's shoulder stones which serve as a remembrance before the LORD.