Exodus 19:5
Now therefore, if you will obey my voice indeed, and keep my covenant, then you shall be a peculiar treasure to me above all people: for all the earth is mine:
Torrey's Topical Textbook—AKJV

Psalm 135:4
For the LORD has chosen Jacob to himself, and Israel for his peculiar treasure.
Torrey's Topical Textbook—AKJV