Murmur.

John 6:64
However, there are some of you who do not believe." (For Jesus had known from the beginning which of them did not believe and who would betray Him.)

John 16:19
Aware that they wanted to question Him, Jesus said to them, "Are you asking one another why I said, 'In a little while you will not see Me, and then after a little while you will see Me'?

Matthew 16:8
Aware of their conversation, Jesus said, "You of little faith, why are you talking among yourselves about having no bread?

Mark 9:33
Then they came to Capernaum. While Jesus was in the house, He asked them, "What were you discussing on the way?"

Hebrews 4:13
Nothing in all creation is hidden from God's sight; everything is uncovered and exposed before the eyes of Him to whom we must give account.