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 their words were not but that they said, "Our Lord, forgive us our sins and the excess [committed] in our affairs and plant firmly our feet and give us victory over the disbelieving people."
And do not kill the soul [i.e., person] which Allāh has forbidden, except by right. And whoever is killed unjustly - We have given his heir authority, but let him not exceed limits in [the matter of] taking life. Indeed, he has been supported [by the law].