John 6:27-29

27Do not labor for the food which perishes, but for the food which endures to everlasting life, which the Son of Man will give you, because God the Father has set His seal on Him.”

28Then they said to Him, “What shall we do, that we may work the works of God?”

29Jesus answered and said to them, “This is the work of God, that you believe in Him whom He sent.”