Surah 17. Al-Israa, Ayah 27

Since squandering - in the sense explained in the preceding note - implies an utter lack of gratitude for the gift of sustenance bestowed by God upon man, the squanderers are described as being "of the ilk [lit., "brethren"] of the satans". Regarding the deeper meaning of the terms "satans" and "satanic", see surah {15}, note [16].

Spendthrifts are not merely fools. They are of the same family as the Satans. And the Satan himself-fell by his ingratitude to Allah. So those who misuse or squander Allah's gifts are also ungrateful to Allah.