Strong’s Greek
G2684 — kataskopeo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
κατασκοπέω
kataskopeo — pronounced kat-as-kop-eh'-o
from 2685; to be a sentinel, i.e. to inspect insidiously:--spy out. see GREEK for 2685
1 occurrence in the KJV.
Galatians 2:4
And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage: