3 Nephi 3:8

And behold, I swear unto you, if ye will do this, with an oath, ye shall not be destroyed; but if ye will not do this, I swear unto you, with an oath, that on the morrow month, I will command that my armies shall come down against you, and they shall not stay their hand, and shall spare not, but shall slay you, and shall let fall the sword upon you, even until ye shall become extinct.

I promise you with an oath: If you do this, you will not be destroyed. But if you do not do this, I promise you with an oath: In one month I will tell my armies to come against you. They will not stop. They will not spare anyone. They will kill you with their swords until you are all gone.

I swear an oath: if you do this, you won’t be destroyed. But if you refuse, I swear another oath: one month from now, I’ll order my armies to march against you. They won’t hold back. They won’t spare anyone. They’ll cut you down until you’re completely wiped out.