John Gill Commentary 1 Kings 21:4

"And Ahab came into his house heavy and displeased because of the word which Naboth the Jezreelite had spoken to him; for he had said, I will not give thee the inheritance of my fathers. And he laid him down upon his bed, and turned away his face, and would eat no bread." — 1 Kings 21:4 (ASV)

And Ahab came into his house heavy and displeased
Just in the same humour he was after the prophet had delivered his message to him, (1 Kings 20:43) , where the same words are used as here:

because of the word which Naboth the Jezreelite had spoken to him, for
he had said, I will not give thee the inheritance of my fathers ,
neither by way of exchange nor of purchase: and such a denial he could not bear, since it looked like treating him with contempt, and taxing him with imprudence at least, if not with injustice, or both:

and he laid him down upon his bed ;
or couch, which might be not in his bedchamber, but in one of his halls, where his courtiers were:

and turned away his face ;
to the wall, not choosing to have conversation with any of his nobles:

and would eat no bread ;
the vexation took away his stomach, and he became melancholy, at least sullen.