John Gill Commentary 1 Kings 22:17

"And he said, I saw all Israel scattered upon the mountains, as sheep that have no shepherd: and Jehovah said, These have no master; let them return every man to his house in peace." — 1 Kings 22:17 (ASV)

And he said
The prophet, in a serious and solemn manner, being adjured by the king:

I saw all Israel scattered on the hills, as sheep that have not a
shepherd ;
the armies of Israel routed, dispersed, and fleeing, some one way and some another, on the mountains of Gilead near Ramoth, weak and helpless, not knowing where to go for safety, having none to direct them; and this was either now instantly represented to his mind, or what had been before in a dream or vision:

and the Lord said, these have no master ;
these sheep have no shepherd this army has no general,

[Israel] has [lost its king]: let them return every man to his house
in peace ,
very few slain, Jarchi thinks Ahab only, see (1 Kings 22:31) that part of the threatening, (1 Kings 20:42) was now to be accomplished, "your life shall go for his life", but the other part, "and your people for his people", was to be deferred to another time.