Strong’s Greek
G69 — agrupneo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ἀγρυπνέω
agrupneo — pronounced ag-roop-neh'-o
ultimately from 1 (as negative particle) and 5258; to be sleepless, i.e. keep awake:--watch. see GREEK for 1 see GREEK for 5258
3 occurrences in the KJV.
Mark 13:33
Take ye heed, watch and pray: for ye know not when the time is.
Ephesians 6:18
Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;
Hebrews 13:17
Obey them that have the rule over you, and submit yourselves: for they watch for your souls, as they that must give account, that they may do it with joy, and not with grief: for that is unprofitable for you.