民数記 14:18

ה' אֶרֶךְ אַפַּיִם “The Lord is long suffering” towards both the righteous and the wicked. When Moses ascended to Heaven to receive the Law he found the Holy One, blessed be He, engaged in writing: “The Lord is long-suffering”. He asked, “Surely only to the righteous?” The Holy One, blessed be He, answered him, “To the wicked also!” Whereupon Moses said: “The wicked — let them perish!” He (the Lord) replied to him: “I swear by your life that you shall eventually need this thing (the extension of My mercy also to the wicked)”. When the Israelites sinned at the incident of the Golden Calf and at that of the spies, Moses offered prayer before Him, with mention of God’s attribute of ארך אפים (of His being long suffering). The Holy One, blessed be He, then said to him: Did you not say, “Surely only to the righteous!?” Whereupon Moses replied, “But did You not tell me, ‘To the wicked also’?” Let then — Moses added — the strength of My Lord be great [even as Thou didst say] — by fulfilling Thy statement and not mine! (Sanhedrin 111a). ונקה AND HE CLEARS those who repent, לא ינקה BUT DOES NOT CLEAR those who do not repent (Yoma 86a; cf. Onkelos and Rashi on Exodus 34:7).

The Lord is longsuffering, and great in love, forgiving iniquity and transgression, but by no means clearing the guilty, punishing the iniquity of the fathers upon the children to the third and fourth generation.

יְהֹוָ֗ה אֶ֤רֶךְ אַפַּ֙יִם֙ וְרַב־חֶ֔סֶד נֹשֵׂ֥א עָוֺ֖ן וָפָ֑שַׁע וְנַקֵּה֙ לֹ֣א יְנַקֶּ֔ה פֹּקֵ֞ד עֲוֺ֤ן אָבוֹת֙ עַל־בָּנִ֔ים עַל־שִׁלֵּשִׁ֖ים וְעַל־רִבֵּעִֽים׃