Jesus
Adam failed to fulfill the mandate given to him in the Garden of Eden. Moses and the house of Israel failed as well to fulfill their mandate given to them by the Lord. This is the history we read about throughout the Old Testament. Over the centuries Israel had an off and on relationship with Jehovah. Sometimes they did well for a generation or two. Eventually, though, they would fail to keep the covenant which God had made with them. They would seek after the gods of the heathen nations until God judged His people. Then they once again would turn in repentance back to Jehovah and His promises of mercy and forgiveness.
Jesus declared to His disciples in Matthew 16 that His church would not fail to fulfill this mandate. The word “church” carries the meaning of a called people who are assembled to govern. The Greek Septuagint (the Greek translation of the Hebrew Scriptures) translates the word as “ecclesia.” Our English translation uses the word church to communicate “assembly.” Christ said, “My Church will not fail.” Fail what? Fail to fulfill the mandate of heaven that was first given in the Garden of Eden and then to Abraham’s descendants. Christ Himself has already fulfilled the mandate by defeating Satan, fulfilling righteousness, and establishing the community of God as His house. Consider what the writer of Hebrews wrote:
For every house is built by someone, but the builder of all things is God. Now Moses was faithful in all His house as a servant, for a testimony of those things which were to be spoken later; but Christ was faithful as a Son over His house — whose house we are if we hold fast our confidence and the boast of our hope firm until the end.
Hebrews 3:4–6 NASB