John 6:30 in the King James Version
They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?
Context
29 Jesus answered them, “This is the work of God, that you believe in him whom he has sent.”
30 They said therefore to him, “What then do you do for a sign, that we may see and believe you? What work do you do?
31 Our fathers ate the manna in the wilderness. As it is written, ‘He gave them bread out of heaven to eat.’”