Resh Lakish said: You have something even greater than this to hear. What is written? "And when a wicked person turns back from his wickedness [and does justice and righteousness, by them he shall live]" (Ezekiel 33:19). "And he shall live" is not written here, but rather "by them he shall live" — for the Holy One, blessed be He, makes them into a merit for him, and he lives by them. Thus: "His palate is most sweet" (Song of Songs 5:16).
Resh Lakish on the Repentant Wicked Living by Their Deeds in Ezekiel
Midrash Tanchuma Buber, Vayetzei 22:6
אמר ריש לקיש יש לך לשמוע גדולה מזו, מה כתיב ובשוב רשע מרשעתו [ועשה מ שפט וצדקה עליהם הוא יחיה] (שם לג יט), וחיה אין כתיב כאן, אלא עליהם הוא יחיה, שהקב"ה עושה אותם לו זכות והוא חי בהם, הוי חכו ממתקים.