Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
58. Chapter: On the permission to take that which is not asked for nor sought after
538. Salim ibn 'Abdullah ibn 'Umar reported from his father, 'Abdullah ibn 'Umar that 'Umar said, "The Messenger of Allah, may Allah bless him and grant him peace, used to give me a gift and I would say, 'Give it to someone who is poorer and more in need of it than I am.' He said, 'Take it. When some property comes to you without your being greedy for it nor asking for it, then take it. But if you are not given anything, do not run after it.'" [Agreed upon]
