30 Also put the Urim and the Thummim in the breastpiece, so they may be over Aaron’s heart whenever he enters the presence of the LORD. Thus Aaron will always bear the means of making decisions for the Israelites over his heart before the LORD.

Read Exodus 28:30 Using Other Translations

And thou shalt put in the breastplate of judgment the Urim and the Thummim; and they shall be upon Aaron's heart, when he goeth in before the LORD: and Aaron shall bear the judgment of the children of Israel upon his heart before the LORD continually.
And in the breastpiece of judgment you shall put the Urim and the Thummim, and they shall be on Aaron's heart, when he goes in before the LORD. Thus Aaron shall bear the judgment of the people of Israel on his heart before the LORD regularly.
Insert the Urim and Thummim into the sacred chestpiece so they will be carried over Aaron’s heart when he goes into the LORD ’s presence. In this way, Aaron will always carry over his heart the objects used to determine the LORD ’s will for his people whenever he goes in before the LORD .