swear to

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Related to swear to: swear words
See: vouch
References in classic literature ?
Let him who shall be victorious and prove to be the better man take the woman and all she has, to bear them to his own home, but let the rest swear to a solemn covenant of peace.
And do you swear to me that you have not touched her?
If you will be one of us this night, we will swear to you upon the naked knife, and by the threefold oath which no Sikh was ever known to break, that you shall have your fair share of the loot.
Give me your hand, Mopo, and swear that you will be faithful to me in this secret, as I swear to you.