An-Nisa 4:39

Wamatha AAalayhim law amanoobillahi walyawmi al-akhiriwaanfaqoo mimma razaqahumu Allahu wakana Allahubihim AAaleema

And what [harm would come] upon them if they believed in Allāh and the Last Day and spent out of what Allāh provided for them? And Allāh is ever, about them, Knowing.

What harm was there for them if they had believed in Allah and the Last Day, and spent out of what Allah had given them. Allah knows all about them.