John Gill Commentary 1 Kings 22:27

"and say, Thus saith the king, Put this fellow in the prison, and feed him with bread of affliction and with water of affliction, until I come in peace." — 1 Kings 22:27 (ASV)

And say, thus says the king, put this fellow in prison
In the common prison of the city, where he had been before, as it seems; and might be now ordered into a more confined place in it, and what might be called "little ease":

and feed him with bread of affliction, and with water of affliction ;
with bad bread and foul water, and but little of either; just enough to keep alive, and to continue starving:

until I come in peace ;
which he seemed confident of, and intimates that then he would punish him more severely, even with death, as a false prophet.