John 6:27-29

Do not work for the food which perishes, but for the food which endures to eternal life, which the Son of Man will give to you, for on Him the Father, God, has set His seal.” Therefore they said to Him, “What shall we do, so that we may work the works of God?” Jesus answered and said to them, “This is the work of God, that you believe in Him whom He has sent.”