Excess is treated in these verses from several angles: in spending, where the right course lies between waste and stinginess, and also in matters other than wealth. They recall that Allah does not like those who commit excess, call the extravagant a brother of Satan, and announce the evil end of the excessive in this world and the Hereafter.
Verses gathered from a topical index of the Quran, in Mushaf order; every verse is quoted in full.
And He it is who causes gardens to grow, [both] trellised and untrellised, and palm trees and crops of different [kinds of] food and olives and pomegranates, similar and dissimilar. Eat of [each of] its fruit when it yields and give its due [zakāh] on the day of its harvest. And be not excessive. Indeed, He does not like those who commit excess.
O children of Adam, take your adornment [i.e., wear your clothing] at every masjid, and eat and drink, but be not excessive. Indeed, He likes not those who commit excess.