2 Kings 6:30

And it came to pass, when the king heard the words of the woman, that he rent his clothes; and he passed by upon the wall, and the people looked, and, behold, he had sackcloth within upon his flesh.

Cross-reference

Isaiah 58:5-7 contrasts outward sackcloth with true repentance — the king's torn clothes here lack the heart change God desires.

Joel 2:13 calls for rending hearts not garments — directly opposing the king's outward tearing of clothes without inner repentance.