John 6:29 WEB

²⁷  Don't work for the food which perishes, but for the food which remains to eternal life, which the Son of Man will give to you. For God the Father has sealed him.'

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

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{Greek and Hebrew use the same word for 'heaven', 'the heavens', 'the sky', and 'the air'.} to eat.''