Catena Fidei

Exodus 20:21 (WEB)
The people stayed at a distance, and Moses came near to the thick darkness where God was.

Catechism · 1

§1867Article 8 · SinRead at vatican.va
“The catechetical tradition also recalls that there are "sins that cry to heaven": the blood of Abel, The sin of the Sodomites, The cry of the people oppressed in Egypt, The cry of the foreigner, the widow, and the orphan,” — Catechism footnote: Cf. Ex 20:20-22.

Origen, Against Celsus VI.17Book VI
“And in order that it may appear that the knowledge of God has rarely been vouchsafed to men, and has been found in very few individuals, Moses is related to have entered into the darkness where God was.” — editor's note: Cf. Ex. xx. 21.
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John Chrysostom, Homilies on Hebrews Homily 32
“He himself who entered into “the darkness where God was,” saith, “I exceedingly fear and quake.” ( Ex. xx. 21.)” — the author cites it
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John Chrysostom, Homilies on Matthew Homily 54
“…He shows a dark cloud;—as on Mount Sinai; for “Moses,” it is said, “entered into the cloud, and into the thick darkness; and as a vapor, so went up the smoke;”and the prophet said, when speaking of His threatening, “Dark water in clouds of the air;”—so here, because it was His desire not to alarm, but to teach, it is…” — editor's note: Exod. xx. 21, xix. 18.
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Augustine of Hippo, On the Holy Trinity II.15Book II
“…“And [when the people saw it,] they removed and stood afar off, and Moses drew near unto the thick darkness where God was, and the Lord said unto Moses,” etc. What shall I say about this, save that no one can be so insane as to believe the smoke, and the fire, and the cloud, and the darkness, and whatever there…” — editor's note: Ex. xx. 18, 21
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Gregory of Nazianzus, Orations Oration 37
“If He had abode upon His own eminence, if He had not condescended to infirmity, if He had remained what He was, keeping Himself unapproachable and incomprehensible, a few perhaps would have followed Him—perhaps not even a few, possibly only Moses—and He only so far as to see with difficulty the Back Parts of God.” — editor's note: Exod. xx. 21; xxxiii. 20, 23.
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