創世記21:1-7

21:1 耶和華按著先前的話眷顧撒拉，便照他所說的給撒拉成就。
21:2 當亞伯拉罕年老的時候，撒拉懷了孕；到上帝所說的日期，就給亞伯拉罕生了一個兒子。
21:3 亞伯拉罕給撒拉所生的兒子起名叫以撒。
21:4 以撒生下來第八日，亞伯拉罕照著上帝所吩咐的，給以撒行了割禮。
21:5 他兒子以撒生的時候，亞伯拉罕年一百歲。
21:6 撒拉說：「上帝使我喜笑，凡聽見的必與我一同喜笑」；
21:7 又說：「誰能預先對亞伯拉罕說『撒拉要乳養嬰孩』呢？因為在他年老的時候，我給他生了一個兒子。」

 Now the Lord was gracious to Sarah as he had said, and the Lord did for Sarah what he had promised. ² Sarah became pregnant and bore a son to Abraham in his old age, at the very time God had promised him. ³ Abraham gave the name Isaac^[a] to the son Sarah bore him. ⁴ When his son Isaac was eight days old, Abraham circumcised him, as God commanded him. ⁵ Abraham was a hundred years old when his son Isaac was born to him.

⁶ Sarah said, “God has brought me laughter, and everyone who hears about this will laugh with me.” ⁷ And she added, “Who would have said to Abraham that Sarah would nurse children? Yet I have borne him a son in his old age.”

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    撒拉清楚以撒的出生是出於上帝，所以她勇敢的宣告：「上帝使我喜笑，凡聽見的必與我一同喜笑」；「誰能預先對亞伯拉罕說『撒拉要乳養嬰孩』呢？因為在他年老的時候，我給他生了一個兒子。」

    而以撒的出生，亞伯拉罕不敢隨便，他在以撒出生第八天的時候，照著上帝所吩咐的，給以撒行了割禮。讓以撒有屬乎上帝子民的記號，讓大家知道他是應許之子！

    說到上帝的應許，我們要用信心來領受，尤其是關乎永生的事情，我們更是要信靠耶穌基督，因為上帝的應許是在基督裏，也因此猶大書20-21節更是我們念念不忘的：「親愛的弟兄啊，你們卻要在至聖的真道上造就自己，在聖靈裡禱告，保守自己常在上帝的愛中，仰望我們主耶穌基督的憐憫，直到永生。」