Imam Mohammad Taqi (as) was only of 25 years when was killed by Mo'tasim by Poison. Curses of Allah (swt) be upon Mo'tasim.

1) Small Miracle of the Imam (as):

قال أبو جعفر: حدثنا أبو محمد، قال: حدثنا عمارة بن زيد، قال: قال إبراهيم بن سعد: رأيت محمد بن علي (عليه السلام) يضرب بيده إلى ورق الزيتون فيصير في كفه ورقا، فأخذت منه كثيرا وأنفقته في الاسواق فلم يتغير

Mohammad bin Yahya says that;

"I saw Imam Mohammad bin Ali (as) hitting his hands upon the leaves of olive trees and the leaves were turning into silver in His hands. And I (the narrator) took lot of silver from it and sold it in the markets and it did not change"

[Source Dalaail al Imaamah, Pg. 398]