4100  pisteuo  pist-yoo'-o

 from 4102; to have faith 
(in, upon, or with respect 
to, a person or thing), i.e. 
credit; by implication, to 
entrust (especially one's 
spiritual well-being to 
Christ):--believe(-r), commit 
(to trust), put in trust 
with.

 see GREEK for 4102