Excess is mentioned in the Quran in these verses:

[2:219] They ask you about intoxicants and gambling: say, “In them there is a gross sin, and some benefits for the people. But their sinfulness far outweighs their benefit.” They also ask you what to give to charity: say, “The excess.” God thus clarifies the revelations for you, that you may reflect,

[9:37] Altering the Sacred Months is a sign of excessive disbelief; it augments the straying of those who have disbelieved. They alternate the Sacred Months and the regular months, while preserving the number of months consecrated by God. They thus violate what God has consecrated. Their evil works are adorned in their eyes. God does not guide the disbelieving people.

[17:26] You shall give the due alms to the relatives, the needy, the poor, and the traveling alien, but do not be excessive, extravagant.

[33:33] You shall settle down in your homes, and do not mingle with the people excessively, like you used to do in the old days of ignorance. You shall observe the Contact Prayers (Salat), and give the obligatory charity (Zakat), and obey God and His messenger. God wishes to remove all unholiness from you, O you who live around the Sacred Shrine, and to purify you completely.

[100:8] He loves material things excessively.

To learn more, read the Quran in English.

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