John Gill Commentary 1 Kings 9:22

"But of the children of Israel did Solomon make no bondservants; but they were the men of war, and his servants, and his princes, and his captains, and rulers of his chariots and of his horsemen." — 1 Kings 9:22 (ASV)

But of the children of Israel did Solomon make no bondmen ,
&c.] For that was contrary to the law; they might be hired servants, but not bond servants, (Leviticus 25:39Leviticus 25:40)

but they were men of war ;
which he kept in pay, a standing army, maintained even in time of peace, in case of necessity, should an enemy attempt to invade or surprise them:

and his servants ;
in his family and court, who had offices and employments there:

and his princes ;
ministers of state, counsellors, governors of cities, &c.

and his captains ;
officers in his army:

and rulers of his chariots and his horsemen ;
war chariots and troopers; see (1 Kings 9:19) .