Pesikta Rabbati on Sarah Nursing the Nations

And what does it mean, the happy mother of children (Psalm 113:9)? Rather, at the time that Sarah bore Isaac, the nations of the world were saying, He is the son of a maidservant and she pretends as if she suckles [meniqah] him. At that time he [Abraham] said to her, Sarah, why are you [just] standing [there]? This is not the time for modesty…