Reference for Shabbat 13:3
הַקּוֹרֵעַ בַּחֲמָתוֹ וְעַל מֵתוֹ, וְכָל הַמְקַלְקְלִין, פְּטוּרִין. וְהַמְקַלְקֵל עַל מְנָת לְתַקֵּן, שִׁעוּרוֹ כַמְתַקֵּן:
If one rends his garment in his wrath, or over his dead one (he is not liable). [It is only over a dead one that he is not obligated to rend over that he is mekalkel ("destroying"), and exempt; but for one he is obligated to rend over, he is metaken ("amending"), and liable.]; and all who are mekalkel are exempt. [This Mishnah is rejected, and the halachah is that one who rends in his wrath is liable. For even though he is mekalkel vis-à-vis the garment, he is metaken vis-à-vis his yetzer (his emotions) and he sets his mind at rest thereby.] and if one is mekalkel in order to be metaken, the amount (for liability) is the same as that for metaken.