Genesis 18:9 (WEB)
They asked him, “Where is Sarah, your wife?” He said, “There, in the tent.”
Catechism · 2
In the Old Testament
“Abraham's remarkable hospitality at Mamre foreshadows the annunciation of the true Son of the promise.” — Catechism footnote: Cf. Gen 18:1-15; Lk 1:26-38.
"I Believe in the Holy Spirit"
“Against all human hope, God promises descendants to Abraham, as the fruit of faith and of the power of the Holy Spirit.” — Catechism footnote: Cf. Gen 18:1-15; Lk 1:26-38. 54-55; Jn 1:12-13; Rom 4:16-21.