Rashi on Exodus 24:11/רש"י על שמות כ״ד:י״א

1ואל אצילי AND UPON THE NOBLES — these were Nadab and Abihu and the elders —

2לא שלח ידו HE LAID NOT HIS HAND — This implies that they well deserved that God should stretch forth His hand against them (Midrash Tanchuma, Beha'alotcha 16).

3ויחזו את האלהים AND THEY BEHELD GOD [AND DID EAT AND DRINK] — They gazed at him intimately as though their association with Him were a matter of eating and drinking. Thus does the Midrash Tanchuma, Beha'alotcha 16 explain it. Onkelos, however, does not translate the passage this way (i. e. he does not take it in a depreciative sense that Nadab and Abihu and the elders acted improperly. His translation is: they beheld God’s Glory and rejoiced in their offerings which were accepted as though they were eating and drinking). —

4אצילי means “the great men”, as, (Isaiah 41:9) “I called thee from the chief men (אציליה) thereof”; (Numbers 11:17) “And he increased (ויאצל) some of the spirit” (cf. Rashi on Numbers 11:17 and Onkelos on 11:25); (Ezekiel 41:8) “six cubits in its size (largeness) (אצילה‎)”.