וַתֹּ֗אמֶר מִ֤י מִלֵּל֙ לְאַבְרָהָ֔ם הֵינִ֥יקָה בָנִ֖ים שָׂרָ֑ה כִּֽי־יָלַ֥דְתִּי בֵ֖ן לִזְקֻנָֽיו׃
And she said: ‘Who would have said unto Abraham, that Sarah should give children suck? for I have borne him a son in his old age.’
Read halakhic rulings (Jewish law) on Genesis 21:7: and classical halakhic sources.