John 6:28-31

²⁸Therefore they said to him, What shall we do, (so) that we work the works of God?

²⁹Jesus answered, and said to them, This is the work of God, that ye believe to him (or so that ye believe in him), whom he sent.

³⁰Therefore they said to him, What token then doest thou, that we see, and believe to thee? what workest thou? (And so they said to him, Then what sign doest thou, so that we can see it, and believe in thee? what miracle workest thou?)

³¹Our fathers ate manna in (the) desert, as it is written, He gave to them bread from heaven to eat.