John 6:26

6:26 Jesus replied, “I tell you the solemn truth, you are looking for me not because you saw miraculous signs, but because you ate all the loaves of bread you wanted.

John 6:61-65

6:61 When Jesus was aware that his disciples were complaining about this, he said to them, “Does this cause you to be offended? 6:62 Then what if you see the Son of Man ascending where he was before? 6:63 The Spirit is the one who gives life; human nature is of no help! The words that I have spoken to you are spirit and are life. 6:64 But there are some of you who do not believe.” (For Jesus had already known from the beginning who those were who did not believe, and who it was who would betray him.) 6:65 So Jesus added, “Because of this I told you that no one can come to me unless the Father has allowed him to come.”