'Sworn' in the Bible

Therefore I have sworn to the house of Eli that the sinful behavior of Eli’s house (family) shall not be atoned for by sacrifice or offering forever.”

Jonathan told David, “Go in safety, inasmuch as we have sworn to each other in the name of the Lord, saying, ‘The Lord shall be between me and you, and between my descendants and yours forever.’” Then he stood and left, while Jonathan went into the city.