Strong’s Greek
G5441 — phulax
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
φύλαξ
phulax — pronounced foo'-lax
from 5442; a watcher or sentry:--keeper. see GREEK for 5442
3 occurrences in the KJV.
Acts 5:23
Saying, The prison truly found we shut with all safety, and the keepers standing without before the doors: but when we had opened, we found no man within.
Acts 12:6
And when Herod would have brought him forth, the same night Peter was sleeping between two soldiers, bound with two chains: and the keepers before the door kept the prison.
Acts 12:19
And when Herod had sought for him, and found him not, he examined the keepers, and commanded that they should be put to death. And he went down from Judaea to Caesarea, and there abode.