It is narrated that one day, Abu Talib was in the company of
some people from Quraish to introduce the lofty position of his
nephew to others,
he said: “Nephew, has Almighty Allah sent you as
a prophet?” “Yes,” replied the Holy (s.a.w.a.). He said: “Prophets
were having miracles. You also show us a miracle.”
The Holy Prophet (s.a.w.a.) said: “Go and tell that tree that
Muhammad bin Abdullah says: O tree, Muhammad is saying: Come
to us.” So, Abu Talib went and said that. The tree arrived and
humbled itself before the Prophet. Then His Eminence ordered: “O
tree, go back to your place.” They saw it return.
Abu Talib said: “I testify for your truthfulness.” And said: “O
Ali, remain in the service of your cousin.”
Behaarul Anwaar, vol. 35, p. 115
Isbaatul Wilayah (Part One) – Ayatullah AliNamazi Shahroodi (r.a.)