John 6:41

ἐγόγγυζον. Talked in an undertone respecting Him: the word in itself does not necessarily mean that they found fault, but the context shews that they did (comp. John 6:61; John 7:12; Matthew 20:11; Luke 5:30). Moreover, O.T. associations have given this shade of meaning to the word, which is frequent in LXX. for the murmurings in the wilderness, especially in the compound διαγογγύζω: comp. 1 Corinthians 10:10. Some members of the hostile party (οἱ Ἰουδαῖοι), and possibly some of the Sanhedrin, were now present; but we are not to understand that the whole multitude were hostile, though carnally-minded and demanding a further sign: John 1:19; John 2:18; John 5:10; John 7:11, &c.

ἐγώ εἰμι … οὐρανοῦ. They put together John 6:33; John 6:35; John 6:38.