How does the sabbath healing lead into testimony about the Son?

Jesus goes to Jerusalem for a Jewish festival. There is a pond called Probatica, named Bethsaida in Hebrew, with five porches. The edition explains Probatica as sheep pond, either because sacrificial sheep were washed there or because it was near the sheep gate. Its note argues that the water had no natural healing virtue, since only the first person entering after its motion was healed. Many sick, blind, lame and withered people wait for the water’s movement: an angel descends at certain times, and the first person entering afterward is made whole. A man has been infirm for thirty-eight years. Jesus sees him lying and asks whether he wants to be made whole. He replies that he has no one to put him into the water when it is troubled, and another goes down before him while he comes. Jesus tells him to rise, take his bed and walk. He immediately becomes whole and walks carrying the bed.

It is the sabbath. The Jews tell him carrying his bed is unlawful, and he replies that his healer commanded it. Asked who that was, he does not know: Jesus has gone aside from the multitude. Later Jesus finds him in the temple and warns him to sin no more lest something worse happen. The man tells the Jews Jesus healed him. They persecute Jesus for doing these things on the sabbath. Jesus answers that his Father works until now and he works. They seek more to kill him, both over the sabbath and his calling God his Father, making himself equal to God.

Jesus says the Son does nothing of himself except what he sees the Father doing, and does the same works. The Father loves him, shows him all his works and will show greater ones to their wonder. As the Father raises the dead and gives life, the Son gives life to whom he wills. The Father gives all judgment to the Son so all honor the Son as the Father; refusing the Son’s honor refuses the sender’s. Hearing Jesus’s word and believing his sender brings everlasting life and passage from death to life without judgment. An hour comes and now is when the dead hear the Son’s voice and those who hear live. As the Father has life in himself, he gives the Son that life and power to judge because he is Son of man. An hour comes when all in graves hear his voice: good deeds lead to resurrection of life and evil deeds to resurrection of judgment, which the edition glosses as condemnation. Jesus’s judgment is just because he judges as he hears and seeks his sender’s will rather than his own.

Jesus says that if he witnesses to himself his witness is not true, and another gives true witness. They sent to John, who testified to truth. Jesus does not receive testimony from man but says this for their salvation. John was a burning, shining light in which they rejoiced for a time. Jesus has greater testimony: the works the Father gave him to perfect testify that the Father sent him. The Father also testifies, though they have neither heard his voice nor seen his shape; his word does not abide in them because they do not believe his sent one. The scriptures in which they think to have everlasting life testify to Jesus, yet they will not come for life. The edition gives the alternative wording that they search the scriptures and explains it as reproach to the Pharisees rather than a command for everyone to read: they refuse the one whom the scriptures attest and through whom alone they could have true life.

Jesus receives no glory from men and says they lack God’s love. He comes in his Father’s name without reception, whereas another coming in his own name would be received. He asks how they can believe while accepting glory from one another without seeking God’s glory alone. Moses, in whom they trust, accuses them; if they believed Moses they would perhaps believe Jesus, since Moses wrote of him. Jesus asks how they will believe his words if they do not believe Moses’s writings.