NET

21 The Hebrews who had earlier gone over to the Philistine side joined the Israelites who were with Saul and Jonathan.

Darby

21 And there were Hebrews with the Philistines^D1831 before that time, who had gone up with them into the camp round about; and they also [turned] to be with the Israelites who were with Saul and Jonathan.

Darby Bible Notes

Philistines - Or 'who belonged, as bondmen, to the Philistines.'

KJV

21 Moreover the Hebrews [that] were with the Philistines before that time, which went up with them into the camp [from the country] round about, even they also [turned] to be with the Israelites that [were] with Saul and Jonathan.

Strong's

21 Moreover the Hebrews^H5680 that were with the Philistines^H6430 before^H865 that time^H8032, which went up^H5927 with them into the camp^H4264 from the the country round about^H5439, even they also turned to be with the Israelites^H3478 that were with Saul^H7586 and Jonathan^H3129.