Genesis 17:19
“And the Lord said to Abraham: "Sarah your wife shall bear you a son, and you shall call his name Isaac." Isaac is interpreted as Laughter, and it is not to be doubted that he was so called because when his birth was announced, Abraham laughed in his heart. This laughter fittingly signifies the joy of the New Testament…”
Source: Septuagint
19And God said to Abraham, Yea, behold, 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, to be a God to him and to his seed after him.
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17And Abraham fell upon his face, and laughed; and spoke in his heart, saying, Shall there be a child to one who is a hundred years old, and shall Sarah who is ninety years old, bear?
18And Abraham said to God, Let this Ishmael live before thee.
— Genesis 17:19 —
20And concerning Ishmael, behold, I have heard thee, and, behold, I have blessed him, and will increase him and multiply him exceedingly; twelve nations shall he beget, and I will make him a great nation.
21But I will establish my covenant with Isaac, whom Sarah shall bear to thee at this time, in the next year.