Genesis 21:1

"Jehovah, thou hast heard the desire of the meek: Thou wilt prepare their heart, thou wilt cause thine ear to hear;"

"And he said, I will certainly return unto thee when the season cometh round; and, lo, Sarah thy wife shall have a son. And Sarah heard in the tent door, which was behind him."

"Is anything too hard for Jehovah? At the set time I will return unto thee, when the season cometh round, and Sarah shall have a son."

"But before faith came, we were kept in ward under the law, shut up unto the faith which should afterwards be revealed."

"And God said, Nay, but Sarah thy wife shall bear thee a son; and thou shalt call his name Isaac: and I will establish my covenant with him for an everlasting covenant for his seed after him."