"For I swear"

1. 2 Sam. 19: 7
     7 Now therefore arise, go forth, and speak comfortably unto thy servants: for I swear by the Lord, if thou go not forth, there will not tarry one with thee this night: and that will be worse unto thee than all the evil that befell thee from thy youth until now.
2. Alma 36: 1
     1 My son, give ear to my words; for I swear unto you, that inasmuch as ye shall keep the commandments of God ye shall prosper in the land.