Alma 25:16

Now they did not suppose that salvation came by the law of Moses; but the law of Moses did serve to strengthen their faith in Christ; and thus they did retain a hope through faith, unto eternal salvation, relying upon the spirit of prophecy, which spake of those things to come.

They didn’t think the law of Moses would save them. But the law of Moses did help make their faith in Christ stronger. This way they kept their hope of living with God forever. They trusted what the Spirit said about things that would happen in the future.

They didn’t think the law of Moses could save them. But it strengthened their faith in Christ. Through faith they held onto the hope of eternal salvation, trusting in the Spirit’s prophecies about what was coming.