juré, prêté serment
He was sworn in as mayor.
Il a prêté serment en tant que maire.
He's sworn on his brother's head.
Il a juré sur la tête de son frère.
— Super 30 (2019)
I have sworn to do so.
J'ai juré de le faire.
— Don Juan DeMarco (1994)
I could have sworn it was heaven.
J'aurais pu jurer que c'était le paradis.
— Field of Dreams (1989)