Alma 46:22

Now this was the covenant which they made; and they cast their garments at the feet of Moroni, saying: We covenant with our God, that we shall be destroyed, even as our brethren in the land northward, if we shall fall into transgression; yea, he may cast us at the feet of our enemies, even as we have cast our garments at thy feet, to be trodden under foot, if we shall fall into transgression.

This was the promise they made. They threw their torn clothes at the feet of Moroni and said: \”We promise to our God that we will be destroyed like our brothers in the land northward if we do wrong. He may throw us at the feet of our enemies like we have thrown our clothes at your feet to be walked on if we do wrong.\”

That was their covenant. They threw their torn clothes at Moroni’s feet, saying: “We make this covenant with God: let us be destroyed like our brothers in the north were destroyed if we turn away from him. Let God throw us at our enemies’ feet to be trampled, just like we’re throwing our clothes at your feet, if we break this promise.”