Daniel
Daniel 9:20ESV·traditional attribution

While I was speaking and praying, confessing my sin and the sin of my people Israel, and presenting my plea before the LORD my God for the holy hill of my God,

John Calvin Reformed @genevareformer

As to the translation, some take it as I do; others say “flying swiftly,” implying fatigue and alacrity. Some derive the word for “flying” from עוף, gnof, which signifies to fly, and they join it with its own participle, which is common Hebrew; others again think it derived from יעף, yegnef; signifying to fatigue, and then explain it metaphorically as flying hastily. See Wintle’s clear and comprehensive note in loc.

Matthew Henry Presbyterian @wholebiblehenry

We have here the answer that was immediately sent to Daniel's prayer, and it is a very memorable one, as it contains the most illustrious prediction of Christ and gospel-grace that is extant in all the Old Testament. If John Baptist was the morning-star, this was the day-break to the Sun of righteousness, the day-spring from on high. Here is, I. The time when this answer was given. 1.

Commenting on Daniel 9:20-27

John Gill Reformed Baptist @doctorgill

And while I was speaking and praying,.... Speaking to God in prayer; for it seems his prayer was vocal, and not mental only: and confessing my sin, and the sin of my people Israel; Daniel, though so holy and good a man, was not without sin, and thought it his duty to confess it before the Lord; and which he did in the first place...