'Belief' in the Bible

Children, it is the last hour [the end of this age]; and just as you heard that the antichrist is coming [the one who will oppose Christ and attempt to replace Him], even now many antichrists (false teachers) have appeared, which confirms our belief that it is the last hour.

Who is false but he who says that Jesus is not the Christ? He is the Antichrist who has no belief in the Father or the Son.

He who has no belief in the Son has not the Father: he who makes clear his belief in the Son has the Father.