1 Samuel 23:13
Then David and his men, which were about six hundred, arose and departed out of Keilah, and went whithersoever they could go. And it was told Saul that David was escaped from Keilah; and he forbare to go forth.
Cross-reference
1 Samuel 22:2
Historical context
1 Samuel 22:2 lists the initial 400 men who joined David, which grew to 600 here.
1 Samuel 30:9
Parallel
1 Samuel 30:9 again mentions David's 600 men going after the Amalekites, continuing this narrative.
1 Samuel 30:10
Parallel
1 Samuel 30:10 specifies that 200 of the 600 were too exhausted, directly from this group.