G4100. pisteuo, pist-yoo'-o; from G4102; to have faith (in, upon, or with respect to, a person or thing), i.e. credit; by impl. to entrust (espec. one's spiritual well-being to Christ):--believe (-r), commit (to trust), put in trust with.
G4102. pistis, pis'-tis; from G3982; persuasion, i.e. credence; mor. conviction (of religious truth, or the truthfulness of God or a religious teacher), espec. reliance upon Christ for salvation; abstr. constancy in such profession; by extens. the system of religious (Gospel) truth itself:--assurance, belief, believe, faith, fidelity.
G3982. peitho, pi'-tho; a prim. verb; to convince (by argument, true or false); by anal. to pacify or conciliate (by other fair means); reflex. or pass. to assent (to evidence or authority), to rely (by inward certainty):--agree, assure, believe, have confidence, be (wax) content, make friend, obey, persuade, trust, yield.
There are three main Greek words having
The verb form of "faith" ("to believe" or "to have faith in") ("pisteuo" in Greek) means "to trust".
The noun form of "faith" ("pistis" in Greek)
Heb 11:1 Now faith is being sure of what we hope for and certain of what we do not see.
Heb 11:6 And without faith it is impossible to please God, because anyone who comes to him
must believe that he exists and that he rewards those who earnestly seek him.
James 2:14-24 What good is it, my brothers, if a man claims to have faith but has no deeds? Can such faith save him? {15} Suppose a brother or sister is without clothes and daily food. {16} If one of you says to him, "Go, I wish you well; keep warm and well fed," but does nothing about his physical needs, what good is it? {17} In the same way, faith by itself, if it is not accompanied by action, is dead. {18} But someone will say, "You have faith; I have deeds." Show me your faith without deeds, and I will show you my faith by what I do. {19} You believe that there is one God. Good! Even the demons believe that--and shudder. {20} You foolish man, do you want evidence that faith without deeds is useless ? {21} Was not our ancestor Abraham considered righteous for what he did when he offered his son Isaac on the altar? {22} You see that his faith and his actions were working together, and his faith was made complete by what he did. {23} And the scripture was fulfilled that says, "Abraham believed God, and it was credited to him as righteousness," and he was called God's friend. {24} You see that a person is justified by what he does and not by faith alone.
Uses of "pisteuo" not translated "believe in"
Luke 16:11 So if you have not been trustworthy in handling worldly wealth, who will
trust you with true riches?
John 2:24 But Jesus would not entrust himself to them, for he knew all men.