The children of Israel are a covenant people. God made great promises to them which would be fulfilled as long as they kept his commandments:
This very day the Lord your God is commanding you to observe these statutes and ordinances; so observe them diligently with all your heart and with all your soul. Today you have obtained the Lord’s agreement: to be your God; and for you to walk in his ways, to keep his statutes, his commandments, and his ordinances, and to obey him. Today the Lord has obtained your agreement: to be his treasured people, as he promised you, and to keep his commandments; for him to set you high above all nations that he has made, in praise and in fame and in honor; and for you to be a people holy to the Lord your God, as he promised. (Deuteronomy 26:16–19)
As Christians we are a covenant people. We are in-grafted into the promises of God by our faith in Jesus Christ as Savior and Lord. Our covenant with God is better than the Old Covenant God made with Abraham. Nonetheless, we are still required to live by faith as was Abraham. Yes, we have great promises and blessings, but with them come responsibilities.
Living by faith means trusting in Jesus to supply us with grace to help us to keep the commandments of God. In his Sermon on the Mount, Jesus made it very clear that we are to obey all the commandments from the heart. He said:
Be perfect, therefore, as your heavenly Father is perfect. (Matthew 5:48)
We have not been given a blank check. Our Covenant with God does not cover deliberate sin:
If we deliberately keep on sinning after we have received the knowledge of the truth, no sacrifice for sins is left, but only a fearful expectation of judgment and of raging fire that will consume the enemies of God. (Hebrews 10:26-27)
Do we consider ourselves a treasured people, holy to God? If so, we will find great joy in keeping the commandments as God supplies us with his grace.
Happy are they whose way is blameless,
who walk in the law of the LORD!
Happy are they who observe his decrees
and seek him with all their hearts! (Psalm 119:1–2)