Mosiah 29:20

But behold, he did deliver them because they did humble themselves before him; and because they cried mightily unto him, he did deliver them out of bondage: and thus doth the Lord work with his power in all cases among the children of men, extending the arm of mercy towards them that put their trust in him.

But he saved them because they humbled themselves before him. Because they cried out to him, he saved them from being slaves. This is how the Lord uses his power to help all people. He shows mercy to those who trust in him.