And they had tails like unto scorpions; a kind of venomous serpents that have their stings in their tails, with which they presently kill both men and beasts. And their power was to hurt men five months; what these five months mean is very hard to say; certainly it is a certain number for an uncertain, and mentioned rather than any other time, because it is (as they say) the usual time of the life of locusts; though some observe, that five months have in them (counting as the Hebrews, thirty days to the month) one hundred and fifty days, and a day standing for a year, as in prophetical writings, it denoteth the just time the Saracens raged in Italy, from the year 830 to the year 980; as to which I refer my reader to search histories.
Related Commentaries of Revelation 9:10
Revelation 9:10
10 And they had tails like unto scorpions, and there were stings in their tails: and their power was to hurt men five months.