Catena Fidei

Genesis 18:6 (WEB)
Abraham hurried into the tent to Sarah, and said, “Quickly prepare three seahs of fine meal, knead it, and make cakes.”

Catechism · 2

§2571Article 1 · In the Old TestamentRead at vatican.va
“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.

§706Article 8 · "I Believe in the Holy Spirit"Read at vatican.va
“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.

Jerome, Letters Letter 66
“I hear that you have erected a hospice for strangers at Portus and that you have planted a twig from the tree of Abraham upon the Ausonian shore.” — editor's note: i.e. the oak of Mamre under which he entertained the three angels (Gen. xviii. 1–8).
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Clement of Alexandria, The Instructor III.10Book III
“For Abraham said to her, “Haste, and knead three measures of meal, and make cakes.”” — editor's note: Gen. xviii. 6.
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Clement of Alexandria, The Stromata, or Miscellanies V.12Book V
“And was it not this which the prophet meant, when he ordered unleavened cakes to be made, intimating that the truly sacred mystic word, respecting the unbegotten and His powers, ought to be concealed?” — editor's note: Alluding to Gen. xviii. 6; the word used is ἐγκρυφίαι, which Clement, following Philo, from its derivation, takes to signify occult mysteries.
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