It is reported that Yūnus b. ‘Ubayd – Allāh have mercy on him – said:

I do not know anything rarer than a good dirham (money earnt lawfully) whose owner spends it on something right, or a brother in Islām in whose company one finds peace. And they are only getting rarer.

Abu Nu’aym, Hilyatu Al-Awliyā' 3:17