"The presentation of the commandments and the statutes and ordinances that will guide Israel"s life in the land is over now. Deuteronomy 26:16 serves as a concluding bracket around chapters5-26 , matching Moses" introduction to the whole in Deuteronomy 5:1 as well as his introduction to the section setting forth the statutes and ordinances in Deuteronomy 12:1 ..." [1][source]
"If we regard the long section Deuteronomy 5:1 to Deuteronomy 26:15 as containing the heart of the covenant law, both in terms of the general principles and of the specific stipulations (even allowing that in the present setting the material is "law preached" rather than "codified law"), we may regard this small pericope as in the nature of an oath of allegiance (cf. Deuteronomy 29:10-15; Exodus 24:7). In form, the pericope looks like a contract in which the two parties bind themselves by means of a solemn declaration. Moses acts as a covenant mediator between Israel, who declares that she will be Yahweh"s people, and Yahweh, who declares that He will be Israel"s God (cf. Exodus 6:7; Jeremiah 31:33; Ezekiel 36:28). In fact the wording of the pericope makes it clear that both declarations refer to the obligations which must be fulfilled by Israel alone. Yahweh has no obligations to keep, but in grace He has blessings to bestow." [2][source]
"It is not difficult to see in this utterance the Lord"s missionary goal for Israel in a nutshell." [3][source]
Obedience to the revealed will of God will result in maximum blessing for God"s people. Moses proceeded to develop this idea further in chapters27-28. This, then, concludes Moses" second address to the Israelites. [source][source][source]