1 Samuel 30:9

So David went, he and the six hundred men that [were] with him,
&c.] Encouraged by the oracle of the Lord:

and came to the brook Besor;
which Adrichomius ^F17 places in the tribe of Simeon; it is thought to be near Gaza. Aristaeus ^F18 speaks of brooks that flowed by Gaza and Ashdod, places that belonged to the Philistines; some take it to be the river of the wilderness in Amos, (See Gill on Amos 6:14):

where those that were left behind stayed:
or a part of them were left, as the Targum; all the six hundred came to this brook, but two hundred of them were left here, ( 1 Samuel 30:10 ) shows, and stayed here till the rest returned; for this is not to be understood of any that were left behind at Ziklag, for all came from thence to this brook.