Covenant comes right on the heels of election. When God elects individuals, He brings them into the covenant. God first makes His covenant with Abram (Gen. 12). From there, God never violates or diminishes the covenant, but He does add to it throughout Abram’s life and reconfirms it with every generation. We see the power of God’s covenant as He is bound by His own word to bring Israel out of Egypt and establish them in Canaan (Gen. 15:12-16; Exod. 1-14). God establishes His covenant with Israel at Sinai (Exod. 20 ff.), and reveals the conditions, curses, and blessings of it throughout the remainder of the Pentateuch. Everything God does is on the basis of His covenants. Covenant is an indispensable theme in the Pentateuch.
Worship is an important theme in the Pentateuch. This is obvious because there is an entire book dedicated to laws and ceremonies regarding Israel’s relationship with God – Leviticus. We see worship as early as Genesis 4 where Cain kills Abel (can anybody say “worship wars?”) over the issue of worship. Abram builds altars and worships God wherever he goes. Isaac also is a worshiper. We see Jacob first encountering God and worshiping Him on his way to Paddan-aram (Gen. 28:10-22). After the Red Sea crossing, Israel stands on the seashore and worships God (Exodus 15). God spends much of the latter part of Exodus giving the measurements and specifications of the tabernacle which would be the place of worship for Israel. Leviticus pertains to the ceremonial laws of Israel and the regulations of the priests. Again, this deals with worship. Worship is a huge theme in Numbers as well. We even see the wrath of God against the Israelites who worship Baal (Numbers 25). Deuteronomy serves as a repeating of the law of God with much mention of the subject of worship. As Moses ends his ministry and passes the mantle on to Joshua, he sings a song in the presence of Israel (Deuteronomy 32).
Perhaps the Pentateuch can be summed up thusly: God chose His people and brought them into His covenant blessing, and as a result they give Him worship. God has also chosen us who are born again to be His people. We are brought into the new covenant by Jesus Christ and we are called to worship our God and Savior. Much as changed in the past 4,000 years since God first chose the Israelites, but God’s nature and holiness have not.