'Certainly' in the Bible

Her father said, "I most certainly thought that you had utterly hated her; therefore I gave her to your companion. Isn't her younger sister more beautiful than she? Please take her, instead."

He restored the eleven hundred [pieces] of silver to his mother; and his mother said, "I most certainly dedicate the silver to Yahweh from my hand for my son, to make an engraved image and a molten image. Now therefore I will restore it to you."