Sefer HaMitzvot, Negative Commandments
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שהזהיר המוסת שלא ילמד זכות למסית ואפילו יודע לו זכות אין מותר לו להזכירו וללמד. והוא אמרו יתברך לא תחמול ובא הפירוש לא תלמד עליו זכות. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
That He prohibited an incited one from arguing the merit of the inciter. Even if he [knows of] a merit for him, it is not permitted for him to mention it and argue [it]. And that is His, may He be blessed, saying, "nor have compassion on him" (Deuteronomy 13:9). And it appears in the explanation (Sifrei Devarim 89:4), "[It means,] do not argue in his merit." (See Parashat Re'eh; Mishneh Torah, Foreign Worship and Customs of the Nations 5.)