Bede

And when they had eaten, they said to him, "Where is Sarah your wife?" He answered, "Behold, she is in the tent." Then he said, "I will return to you at this time next year, if life be with us, and Sarah your wife shall have a son." Both indeed the lords of the house, and evidently Abraham and Sarah, prepared with the utmost haste a meal; but as if in a well-ordered house, Abraham, with the meals prepared, more boldly approached the Lord; Sarah, with womanly fear and modesty, restrained herself in the tent, in fact behind the tent …

Commentary on Genesis (Hexaemeron) ↗