John 6:28-30

Young's Literal Translation

²⁸ They said therefore unto him, `What may we do that we may work the works of God?'

²⁹ Jesus answered and said to them, `This is the work of God, that ye may believe in him whom He did send.'

³⁰ They said therefore to him, `What sign, then, dost thou, that we may see and may believe thee? what dost thou work?