Catena Fidei

Leviticus 19:2 (WEB)
“Speak to all the congregation of the children of Israel, and tell them, ‘You shall be holy; for I, the LORD your God, am holy.

Catechism · 1

§2811Article 3 · The Seven PetitionsRead at vatican.va
“In spite of the holy Law that again and again their Holy God gives them - "You shall be holy, for I the LORD your God am holy" - and although the Lord shows patience for the sake of his name, the people turn away from the Holy One of Israel and profane his name among the nations.” — Catechism footnote: Ezek 20:9, 14, 22, 39; cf. Lev 19:2.

Cyprian of Carthage, Epistles Letter 69
“And therefore he must be baptized and renewed who comes untrained to the Church, that he may be sanctified within by those who are holy, since it is written, “Be ye holy, for I am holy, saith the Lord.”” — editor's note: Lev. xix. 2.
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Ambrose of Milan, Exposition of the Christian Faith II.13Book II
“I would have had thee to be good, and I said ‘Be ye holy, for I Myself am holy,’ and thou settest thyself to deny that I am good?” — editor's note: Lev. xix. 2.
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Ambrose of Milan, On the Holy Spirit I.5Book I
“For both the man who receives and God Who gives sanctity are called holy, as we read: “Be ye holy, for I am holy.”” — editor's note: Lev. xix. 2.
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Augustine of Hippo, Expositions on the Psalms Psalm 86
“If holy as making holy, and as needing none to sanctify, I should be proud and false: but if holy as made holy, as it is written, “Be ye holy, for I am holy,” then the body of Christ may venture, and that one Man “crying from the end of the earth,” may venture with his Head, and under his Head, to say, “For I am holy.”” — editor's note: Lev. xix. 2.
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Jerome, Letters Letter 118
““Be ye holy, saith the Lord, for I am holy.”” — editor's note: Lev. xix. 2; 1 Pet. i. 16.
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Tertullian, On Exhortation to Chastity Chapter 9
“For there is a prophetic utterance of the Old Testament: “Holy shall ye be, because God is holy;” and again: “With the holy thou shalt be sanctified; and with the innocent man thou shalt be innocent; and with the elect, elect.”” — editor's note: See Lev. xi. 44, 45; xix. 2; xx. 7, LXX. and Vulg.
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Numbers 13:26
Leviticus 19:2 and Numbers 13:26 share the same wording (9 words).