Ex 19:5

19:5 obey my voice and keep my covenant. Terms summarizing the proper human response to God’s gracious covenant (Gen. 17:2 note). The latter phrase (Gen. 17:9, 10; 1 Kin. 11:11; Ps. 78:10; 103:18; 132:12; Ezek. 17:14) always refers to fidelity to a previously revealed covenant. Since 6:4 has referred to the Exodus as the fulfillment of the patriarchal covenant, the revelation at Sinai must also be seen as an extension of the Abrahamic covenant.

treasured possession. As the following clause shows, God means that Israel will be His personal treasure within what is more generally owned (1 Chr. 29:3). Israel is separated by God’s election from the world that belongs to Him.