Exodus 16 supplies the manna background; later Jewish expectation could associate manna with eschatological provision.
Exodus 16:4-15; Psalm 78:23-25 are the principal backgrounds.
Jesus is not merely another provider of bread. He is the true bread given from heaven, and eternal life and final resurrection depend upon coming to and believing in him.
The combination of heavenly origin, life-giving identity, and authority to raise believers at the last day is strongly divine in scale.