John 6:28-31

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

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

³⁰Therefore they said to him, What token then doest thou, that we see, and believe to thee? what workest thou?

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