27. Work not for the food which perishes, but for the food which abides unto life eternal, which the Son of man shall give to you; for him has the Father sealed, even God.
28. They said therefore to him, What should 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 believe on him whom he has sent.
30. They said therefore to him, What sign then doest thou that we may see and believe thee? what dost thou work?