Yeshua (Jesus) quoted this sacred scriptures (Matthew 18) from Ben Sira (Old Testament/Tanakh):

Ben Sira 27:30-28:7 New American Bible (Revised Edition)

³⁰ Wrath and anger, these also are abominations,
    yet a sinner holds on to them.

Chapter 28

¹ The vengeful will face the Lord’s vengeance;
    indeed he remembers their sins in detail.

² Forgive your neighbor the wrong done to you;
    then when you pray, your own sins will be forgiven.
³ Does anyone nourish anger against another
    and expect healing from the Lord?
⁴ Can one refuse mercy to a sinner like oneself,
    yet seek pardon for one’s own sins?
⁵ If a mere mortal cherishes wrath,
    who will forgive his sins?
⁶ Remember your last days and set enmity aside;
    remember death and decay, and cease from sin!
⁷ Remember the commandments and do not be angry with your neighbor;
    remember the covenant of the Most High, and overlook faults.

I study learn something new Dr Brant Pitre share deep anointing sacred scriptures Jesus quoted Matthew 18:21-35 from Sirach 27:30-28:7—Forgive Your Neighbor’s Injustice:

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“Malice, Anger and Vengeance” are the powerful key.

CCC #2843
Thus the Lord’s words on forgiveness, the love that loves to the end,142 become a living reality. The parable of the merciless servant, which crowns the Lord’s teaching on ecclesial communion, ends with these words: “So also my heavenly Father will do to every one of you, if you do not forgive your brother from your heart.”143 It is there, in fact, “in the depths of the heart,” that everything is bound and loosed. It is not in our power not to feel or to forget an offense; but the heart that offers itself to the Holy Spirit turns injury into compassion and purifies the memory in transforming the hurt into intercession.

142 Cf. Jn 13:1.
143 Cf. Mt 18:23-35.

CCC #368
The spiritual tradition of the Church also emphasizes the heart, in the biblical sense of the depths of one’s being, where the person decides for or against God.239

239 Cf. Jer 31:33; Deut 6:5; 29:3; Isa 29:13; Ezek 36:26; Mt 6:21; Lk 8:15; Rom 5:5.

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