Catena Fidei

Hebrews 3:7 (WEB)
Therefore, even as the Holy Spirit says, “Today if you will hear his voice,

Catechism · 2

§1165Article 1 · Celebrating the Church's LiturgyRead at vatican.va
“When the Church celebrates the mystery of Christ, there is a word that marks her prayer: "Today!" - a word echoing the prayer her Lord taught her and the call of the Holy Spirit.” — Catechism footnote: Cf. Mt 6:11; Heb 3:7- 4:11; Ps 95:7.

§117Article 3 · Sacred ScriptureRead at vatican.va
The spiritual sense. Thanks to the unity of God's plan, not only the text of Scripture but also the realities and events about which it speaks can be signs.

Gregory of Nyssa, Against Eunomius II.14Book II
“…“Wherefore, as the Holy Ghost saith, Harden not your hearts, as in the provocation, in the day of temptation in the wilderness; when your fathers tempted me,” and goes on to refer all that the prophecy refers to God, to the Person of the Holy Ghost.” — editor's note: Heb. iii. 7.
Read the whole comment
Gregory of Nyssa, Against Eunomius VII.1Book VII
“…Jews in Rome, introducing the words of Isaiah; and to the Hebrews, alleging the authority of the Holy Spirit in the words, “wherefore as saith the Holy Spirit,” he adduces the words of the Psalm which are spoken at length in the person of God; and from the Lord Himself we learn the same thing,—that David declared the…” — editor's note: Heb. iii. 7.
Read the whole comment

Cyril of Jerusalem, Catechetical Lectures Lecture 18
“And again, Wherefore, as saith the Holy Ghost; and again, The Holy Ghost also witnesseth to us.” — editor's note: Heb. iii. 7.
Read the whole comment

John Chrysostom, Homilies on Hebrews Homily 6
“Hebrews iii. 7–11” — the author cites it
Read the whole comment
John Chrysostom, Homilies on Hebrews Homily 8
“And as, in [the matter of] punishment, he brings before them not Hell alone, but also what happened to their fathers, so now here also, he first establishes this position from things present.” — editor's note: c. iii. 7 , &c.
Read the whole comment

Ambrose of Milan, On the Holy Spirit III.8Book III
“Forty years was I near to this generation and said: They do alway err in their heart; but they did not know My ways, as I sware in My wrath, If they shall enter into My rest.”” — editor's note: Heb. iii. 7–11.
Read the whole comment