Muhammad bin Sirin said: In the time of Uthman bin Affan (may Allah be pleased with him), the price of a date palm reached one thousand dirhams. He said: Usamah went to a date palm, cut into it and took out its heart (pith), then fed it to his mother. People said to him: What made you do this, when you see that the date palm has reached a thousand? He said: "My mother asked me for it, and she does not ask me for anything within my power except that I give it to her."
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 367