The healing of the lame man at Bethesda and Jesus saying that He is the Son of God upset many of the people.

The dead will hear His voice and raise again to eternal life.

The witness of John is that Jesus would increase, that he might decrease. The scripture told of Jesus coming, as the writing of Moses told the Jews, so they should have believed.

Jesus fed the 5 thousand and walked on water, this shows who Jesus is and Peter recognized Jesus as the Son of God.