“Therefore Jesus answered them, ‘Don’t murmur among yourselves.‘” – John 6:43
Murmur is the onomatopoeic word, gogguzó. It’s supposed to sound like “cooing doves” (Strongs). It means to mutter with muffled undertones; to show “smoldering discontent,” droning on in a low, constant grumble (Souter).
Jesus said it’d be great if you didn’t do that.