John 6:27-29

Young's Literal Translation

²⁷ work not for the food that is perishing, but for the food that is remaining to life age-during, which the Son of Man will give to you, for him did the Father seal -- [even] God.'

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.'