Do you want Allah to call you before the Head of all the creations an to reward you?
Muslim must be thankful to Allah and enjoys his gifts but not to be excessive in expenses.
Being excessive means automatically that we deprive others of their rights!
The Prophet, peace and blessings be upon him, said: “When someone is secure in his property, healthy in his body and has his food for the day, it is as if he owned the entire world”.
Al-Manaawi (may Allaah have mercy on him) said:
The one for whom Allaah has combined the blessings of physical good health, a sense of security wherever he goes and sufficient provision for the day, and kept his family safe, has been given all type of blessings by Allaah, which others may not have in full, so he should not start his day without give thanks for that, by using these blessings in obedience to the One Who bestowed them on him, not in disobedience, or and he should never cease to remember Him.
So as Muslims , we must be modest in all faces of life , and Allah the most Merciful set many qualities of his servants , one of them is his Almighty describes :
25.67 ) And [they are] those who, when they spend, do so not excessively or sparingly but are ever, between that, [justly] moderate
So when in many poor and forgotten countries, thousands of persons and kids are sick or died because of diseases while 40% of golf ( waste) is food, this should make us think about our behavior as Muslim.
This is same in western countries; food is the big waste for rich countries!
So how can we be selfish, how can we throw the gifts of Allah when others are needy?
Allah bless us with many gifts and asked us to be moderate in spending :
7.31)O children of Adam, take your adornment at every masjid, and eat and drink, but be not excessive. Indeed, He likes not those who commit excess.
Abu bakr al sidiq said: “I dislike seeing a family spending the rizk of many days in one day”.
So how selfish are we , when we spend a lot of money to buy, car, dress or watch because it belongs to a famous brand , while only few dollars can sponsor a child in somalia!
Listen to this hadith :
Sahl bin Mu’adh bin Anas Al-Juhani narrated from his father, that the Messenger of Allah (s.a.w)said: “Whoever leaves(valuable) dress out of humility to Allah while he is able to (afford it), Allah will call him before the heads of creation on the Day of Judgement so that he can chose whichever Hulal of faith he wishes to wear.” (Hasan)
To be moderate in your expenses , you will save human and rewarded as well by the Most Merciful.