Benjamin declares, “Wo unto him who knoweth that he rebelleth against God!” That condition of intentional rebellion hearkens to the earlier statement in Mosiah 2:38–39 that the unrepentant have no claim to God’s mercy. There is one covenant way to be saved, and it requires obedience to the covenant, as well as to the atonement of the coming Messiah.
Just as Benjamin indicated in Mosiah 2:34–35, these things have been taught by the holy prophets. Therefore, they have been taught to this people and they are under the requirements of the law. They know the law and the prophecies, therefore, they must willingly reject them if they are to deny them.
The law is the guide to salvation. Benjamin returns to the beginning of the law as the means to enact the covenant. When the Israelites were in a state where they might not live according to the covenant after their time in Egypt, the law was given to them to guide them in the right way to live in order to obtain the blessings of the covenant. While explaining the mission of the Messiah, Benjamin is careful to place that mission inside the covenant.