Tafseer Ibn Kathir of AL FURQAAN [67]

وَالَّذِينَ إِذَا أَنفَقُوا لَمْ يُسْرِفُوا وَلَمْ يَقْتُرُوا وَكَانَ بَيْنَ ذَلِكَ قَوَامًا

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