'Took an Oath' in the Bible

Then said they, We will restore them, and will require nothing of them; so will we do as thou sayest. Then I called the priests, and took an oath of them, that they should do according to this promise.

And I reproved them, and cursed them, and smote certain men of them, and plucked them up, and took an oath of them by God, "Ye shall not give your daughters unto their sons, neither shall ye take their daughters unto your sons, or for yourselves.