The interpretation timeline
Luke 9:34 Douay-Rheims

And as he spoke these things, there came a cloud, and overshadowed them; and they were afraid, when they entered into the cloud.

A.D. 253 – 1871 4 witnesses

Patristic

before A.D. 750
253
A.D.
Origen Patristic
c. A.D. 184–253
“(in Matt. tom. 12.) Now His disciples being unable to bear this, fell down, humbled under the mighty hand of God, greatly afraid since they knew what was said to Moses, No man shall see my face, and lice. Hence it follows, And they feared as they entered into the cloud.”

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“But while Peter spake, our Lord builds a tabernacle not made with hands, and enters into it with the Prophets. Hence it is added, While he thus spake there came a cloud and overshadowed them, to shew that He was not inferior to the Father. For as in the Old Testament it was said, the Lord dwelt in the cloud, so now also a cloud received our Lord, not a dark cloud, but bright and shining.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And it came to pass, that on the next day,.... For Jesus and his disciples staid all night on the mountain: when they were come down from the hill; to the bottom of it: much people met him. The Vulgate Latin, Syriac, and Persic versions read, "met them".”
1871
A.D.
1871
“a cloud--not one of our watery clouds, but the Shekinah-cloud (see on Mat 23:39), the pavilion of the manifested presence of God with His people, what Peter calls "the excellent" of "magnificent glory" (Pe2 1:17). a voice--"such a voice," says Peter emphatically; "and this voice [he adds] we heard, when we were with Him in the holy mount" (Pe2 1:17-18).”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.