Genesis 18:9
“And they said unto him, Where is Sarah thy wife? And he said, Behold, in the tent.”
KJV
Read in Genesis 18Meaning
The visitors ask specifically about Sarah, and Abraham replies that she is inside the tent.
Read carefully
The question functions narratively to bring Sarah into focus; it need not be treated as evidence that the visitors lack knowledge of her location.
Reflection
After the meal, the story turns directly toward Sarah, signaling that the promised birth concerns her personally and not only Abraham.