Strong's G3726 — ὁρκίζω (verb)
horkizo (hor-kid'-zo) v.
1. to put on oath, i.e. make swear
2. (by analogy) to solemnly enjoin
[from G3727]
KJV: adjure, charge 
Root(s): G3727 
Hebrew root: ὅρκος
Occurrences: 3