Strong's G3784 — ὀφείλω (verb)
opheilo (of-ei'-lo) (or (in certain tenses), its prolonged form opheileo  of-ei-leh'-o) v.
1. to owe (finacially)
2. (figuratively) to be under obligation, indebted (ought, must, should)
3. (morally) to fail in duty
[probably from the base of G3786 (through the idea of accruing)]
KJV: behove, be bound, (be) debt(-or), (be) due(-ty), be guilty (indebted), (must) need(-s), ought, owe, should 
Root(s): G3786 
See also: G3785 
Hebrew root: ὄφελος
Occurrences: 35