Leviticus 10:9 - Joseph Benson’s Commentary on the Old and New Testaments

Do not drink wine nor strong drink It is certainly not improbable that the sin of Nadab and Abihu was owing to this. But if not, yet drunkenness is so odious a sin in itself, especially in a minister, and most of all at 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. By strong drink here, is meant such inflammatory, intoxicating liquors as were made in imitation of wine, as of dates, figs, honey, with many other sorts of liquors, particularly palm-wine, which was much used in those countries, and was reckoned the most intoxicating of any. The intention of this law was to be always in force: accordingly it is required of the ministers of the gospel, that they be sober, not given to wine.