John Gill Commentary 2 Samuel 14:31

"Then Joab arose, and came to Absalom unto his house, and said unto him, Wherefore have thy servants set my field on fire?" — 2 Samuel 14:31 (ASV)

Then Joab arose, and came to Absalom unto [his] house
Provoked at what he had done, and to know the reason of it; and which was answering Absalom's end:

and said unto him, why have your servants set my field on fire ?
which was not only injurious to his property, but a malicious action.