the people in the court room swore to tell the whole truth.
The villain swore vengeance on the superhero.
I swore not to repeat the mistake again.
Andrea swore her new boss was the devil incarnate!
Yes
He swore on the honor of his knighthood that he would slay the dragon and save the princess.
The student swore to keep his chastity at least through high school.
He swore to take revenge on his enemy for betraying him, turning it into a personal vendetta.
The correct preposition in the sentence is "as." Griffin swore up and down that his comment had been meant as a compliment.
Savannah swore a VOW of vengeance against the man, the beast, that killed him.
has sworn
The bully swore he was dauntless so all the freshmen would fear him.
They swore an oath to maintain concord between their two nations.