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Genesis 9:6 (WEB)
Whoever sheds man’s blood, his blood will be shed by man, for God made man in his own image.

Catechism · 2

§2260Article 5 · The Fifth CommandmentRead at vatican.va
“Whoever sheds the blood of man, by man shall his blood be shed; for God made man in his own image.” — Catechism footnote: Gen 9:5-6.

§2569Article 1 · In the Old TestamentRead at vatican.va
Prayer is lived in the first place beginning with the realities of creation. the first nine chapters of Genesis describe this relationship with God as an offering of the first-born of Abel's flock, as the invocation of the divine name at the time of Enosh, and as "walking with God.

Irenaeus of Lyons, Against Heresies V.14Book V
“And as their blood will be inquired after, He said to those with Noah, “For your blood of your souls will I require, [even] from the hand of all beasts;” and again, “Whosoever will shed man’s blood, it shall be shed for his blood.”” — editor's note: Gen. ix. 5, 6, LXX.
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John Damascene, An Exact Exposition of the Orthodox Faith IV.27Book IV
“Whoso sheddeth man’s blood, for his blood his own shall be shed, for in the image of God made I man.” — editor's note: Gen. ix. 3, 4, 5, 6.
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Cyril of Jerusalem, Catechetical Lectures Lecture 15
“At that time God said, let us make man after our image and after our likeness.” — editor's note: Gen. i. 26. “The ancient Church very accurately distinguished between εἰκών (image) and ὁμοίωσις (likeness), and the Greek Church does the same in its…
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Theodoret of Cyrus, Dialogues (Eranistes) §3
“Orth.—And rightly; for since the whole first man became subject to sin, and lost the impression of the Divine Image, and the race followed, it results that the Creator, with the intention of renewing the blurred image, assumed the nature in its entirety, and stamped an imprint far better than the first.” — editor's note: This “lost” must be qualified. The Scriptural doctrine is that the “image of God” though defaced and marred, is not lost or destroyed. After the flood the…
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Jerome, Letters Letter 51
“And surely your blood will I require at the hand of every man that sheddeth it; for in the image of God have I made man.”” — editor's note: Gen. ix. 4–6; substantially as in A.V.
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Tertullian, On Fasting Chapter 4
“For the Lord had already shown His judgment through the deluge; had, moreover, likewise issued a comminatory warning through the “requisition of blood from the hand of a brother, and from the hand of every beast.”” — editor's note: See Gen. ix. 5, 6.
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Tertullian, On Idolatry Chapter 15
“…to Cæsar what are Cæsar’s, and what are God’s to God;” that is, the image of Cæsar, which is on the coin, to Cæsar, and the image of God, which is on man, to God; so as to render to Cæsar indeed money, to God yourself.” — editor's note: See Gen. i. 26, 27; ix. 6; and comp. 1 Cor. xi. 7.
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Tertullian, On the Resurrection of the Flesh Chapter 39
“He mentions also what is written by “Moses,” touching the resurrection of the dead; (and in so doing) he must have known that it would be a rising in the body, since requisition will have to be made therein of the blood of man.” — editor's note: Gen. ix. 5, 6.
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Hilary of Poitiers, On the Trinity Book 4
“One of the many commandments which God gave to Noah is, Whoso sheddeth man’s blood, for his blood shall his life be shed, for after the image of God made I man.” — editor's note: Ib. ix. 6.
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