'Believe' in the Bible

The elders [of the tribes] will listen and pay attention to what you say; and you, with the elders of Israel, shall go to the king of Egypt and you shall say to him, ‘The Lord, the God of the Hebrews, has met with us; so now, please, [we ask and plead with you,] let us go on a three days’ journey into the wilderness, so that we may sacrifice to the Lord our God.’

Then Moses answered [the Lord] and said, “What if they will not believe me or take seriously what I say? For they may say, ‘The Lord has not appeared to you.’”

[“You shall do this,” said the Lord,] “so that the elders may believe that the Lord, the God of their fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has [most certainly] appeared to you.”

“If they will not believe you or pay attention to the evidence of the first sign, they may believe the evidence of the second sign.

But if they will not believe these two signs or pay attention to what you say, you are to take some water from the Nile and pour it on the dry ground; and the water which you take out of the river will turn into blood on the dry ground.”

The Lord said to Moses, “Behold, I will come to you in a thick cloud, so that the people may hear when I speak with you and may believe and trust in you forever.” Then Moses repeated the words of the people to the Lord.