Fatima binte Asad (s.a.) is reported to have said: There was a tree in the compound of our house which had dried up for long. One day when the Holy Prophet (s.a.w.a.) came near it and rubbed his hand on it; it became green at once and fresh dates grew on it. She says: I used to gather fresh dates daily for the Holy Prophet (s.a.w.a.), kept the same for him and put before him whenever he came. He was taking it out and distributing among the children of Bani Hashim. One day when the Holy Prophet (s.a.w.a.) arrived I excused saying: Today no dates appeared on the tree. Fatima says: By the radiance of the holy face of the Holy Prophet (s.a.w.a.)! As soon as he heard it, he went to tree and recited a few words. Then I saw that one of those trees bent so much that Prophets hand reached its top branch and he plucked as many dates as he liked. Thereafter that tree reverted to its original position.
At that moment I prayed to Allah with total humility: O Lord of the earth and heavens, grant me also a son who may be his brother and who may resemble him. That very night I conceived Ali and after his birth, Ali never approached idol-worship or worship anyone but Only One God. Hayaat al-Quloob v 2 chap 4