John 6:26-30

26Jesus answered them and said, Verily, verily, I say unto you, Ye seek me, not because ye saw signs, but because ye ate of the loaves, and were filled. 27Work not for the food which perisheth, but for the food which abideth unto eternal life, which the Son of man shall give unto you: for him the Father, even God, hath sealed. 28They said therefore unto him, What must we do, that we may work the works of God? 29Jesus answered and said unto them, This is the work of God, that ye believe on him whom he hath sent. 30They said therefore unto him, What then doest thou for a sign, that we may see, and believe thee? what workest thou?