How should the believers preserve the rights of orphans?

 

Verse 220 of Chapter 2

… And they ask you concerning orphans. Say: "The best thing is to work honestly in their property, and if you mix your affairs with theirs, then they are your brothers. And Allah knows (the one) who means mischief (e.g., to swallow their property) from (the one) who means good (e.g., to save their property). And if Allah had wished, He could have put you into difficulties. Truly, Allah is All-Mighty, All-Wise.

Verse 10 of Chapter 4
Verily, those who unjustly eat up the property of orphans, they eat up only fire into their bellies, and they will be burnt in the blazing Fire!