John 6:30 in the World English Bible
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?
Context
29 Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent.
30 They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?
31 Our fathers did eat manna in the desert; as it is written, He gave them bread from heaven to eat.