John 6:60
Thus many of his disciples, [when they] heard [it], said, "This saying is hard! Who can understand it?"
John 6:66
For this [reason] many of his disciples {drew back} and were not walking with him any longer.
Matthew 11:6
And whoever is not offended by me is blessed."
John 6:41-42
Now the Jews began to grumble about him because he said, "I am the bread that came down from heaven,"
John 8:31
Then Jesus said to those Jews who had believed him, "If you continue in my word you are truly my disciples,
John 8:43
{Why} do you not understand my way of speaking? Because you are not able to listen to my message.
Hebrews 5:11
Concerning this {we have much to say and it is difficult to explain}, since you have become sluggish in hearing.
2 Peter 3:16
as [he does] also in all his letters, speaking in them about these [things], in which there are some [things] hard to understand, which the ignorant and unstable distort to their own destruction, as [they] also [do] the rest of the scriptures.