Hazrat Rasulullah (sallallahu ‘alaihi wasallam) granted Hazrat Talhah (radhiyallahu ‘anhu) the title of Talhah Al-Fayyaadh (an extremely generous person) on two occasions. Below is one such occasion:
During the battle of Zi Qarad, Hazrat Rasulullah (sallallahu ‘alaihi wasallam) passed by the well of Baisaan. The water of this well was known to be bitter. Hazrat Rasulullah (sallallahu ‘alaihi wasallam) said, ‘This well should be named Na’maan. Na’maan means good.’ Upon Hazrat Rasulullah (sallallahu ‘alaihi wasallam) changing its name, Allah Ta’ala caused the water of the well to become sweet.
Hazrat Talhah (radhiyallahu ‘anhu) purchased this well from its owner and donated its water for the benefit of the muslims. In one narration it is mentioned that during the same battle, he also slaughtered a camel and fed its meat to the people. It was on that occasion that Rasulullah (sallallahu ‘alaihi wasallam) said to him: “O Talhah, certainly, you are Al-Fayyaadh (an extremely generous person).’
(Tareekh Dimashq 25/93)