Exodus 28:29

Aaron (i.e. the high priest), bearing the names of the tribes of Israel both (v.12) on his shoulders (which support the weight and symbol of office, Isaiah 9:6; Isaiah 22:22), and on his heart (implying that they have a constant place in his thoughts, Deuteronomy 6:6), will thus enter the Holy place as Israel's official representative, ever mindful of the nation's interests, and ever bringing the remembrance of it before God;

the pouch of judgement see on v.15. So v.30.

for a memorial to call them to remembrance before God: so v.12; cf. Exodus 30:16; Numbers 10:10; Numbers 31:54.