It was narrated that Ibn 'Abbas said

"When these Verses were revealed - 'And come not near to the orphan's property, except to improve it,' and 'Verily, those who unjustly eat up the property of orphans' - the people avoided the property and food of the orphans. That caused hardship to the Muslims and they complained about that to the Prophet. Then Allah revealed: '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 him who means mischief (e.g. to swallow their property) from him who means good (e.g. to save their property). And if Allah had wished, He could have put you into difficulties.'"