Al-Furqan 25:67

Wallatheena ithaanfaqoo lam yusrifoo walam yaqturoo wakana bayna thalikaqawama

And [they are] those who, when they spend, do so not excessively or sparingly but are ever, between that, [justly] moderate

- and those who, when they spend, are neither extravagant nor miserly, and it (i.e. their spending) is moderate in between (the two extremes,)