At the close of John 5, Jesus says that Moses will accuse his opponents because they have placed their hope in him: 'had ye believed Moses, ye would have believed me: for he wrote of me.'
The argument turns the acknowledged authority of Moses back upon Jesus' hearers.
Moses stood at the foundation of Jewish scriptural identity as the mediator of Torah. John's Gospel does not identify one single Mosaic verse as the exhaustive referent here. Christian interpretation has connected Jesus with several Pentateuchal patterns and promises, including the prophet like Moses, the wilderness serpent, manna, Passover, and broader Torah themes.
The statement should therefore be allowed its canonical breadth rather than artificially restricted to one proof text.
The historical authority of Moses makes Jesus' claim especially bold. He does not present himself as an alternative to Israel's Scriptures but as their intended fulfillment.
For John's readers, the question becomes whether loyalty to Moses and belief in Jesus are truly opposites. Jesus insists that genuine belief in Moses should lead toward belief in him.