John Wesley on Leviticus 10:9

Drink not wine - it is not improbable, that the sin of Nadab and Abihu was owing to this very thing. But if not, yet drunkenness is so odious a sin in itself, especially in a minister, and most of all in the time of his administration of sacred things, that God saw fit to prevent all occasions of it. And hence the devil, who is God's ape, required this abstinence from his priests in their idolatrous service.