On one occasion the poor Sahaabah (Radhiallahu Anhum) complained to Rasulullah (Sallallahu Alaihi Wasallam) saying, “O Nabi of Allah (Sallallahu Alaihi Wasallam), as far as the wealthy among your sahaabah are concerned, then they perform salaah and we also perform salaah, they observe nafl fast and we also observe nafl fast, so in that respect we are equal. However, with regards to spending wealth in the path of Allah Ta’aala, since they are endowed with wealth from the side of Allah Ta’aala, they are able to free slaves and generously spend in the path of Allah Ta’aala whilst we are unable to do so. Hence, we are deprived of the great merits and abundant rewards received through giving alms for the cause of Deen.”
Nabi (Sallallahu Alaihi Wasallam) then taught them the tasbeeh-e-Faatimi, exhorting them to recite after every fardh salaah, 33 times ‘Subhaanallah’, 33 times ‘Alhamdulillah’ ,34 times ‘Allahu Akbar’ and ‘Laa ilaaha illallah’ 10 times. Nabi (Sallallahu Alaihi Wasallam) then told them that if you recite this tasbeeh you will surpass those before you, and those after you will not be able to reach your status and position. There will be no one more superior to you except those who also practice upon this. The poor Sahaabah (Radhiallahu Anhum) immediately commenced reciting this tasbeeh after the five daily salaah (as per the instruction of Rasulullah (Sallallahu Alaihi Wasallam)). When the wealthy Sahaabah (Radhiallahu Anhum) learnt about this, they also began reciting it. The poor Sahaabah (Radhiallahu Anhum) returned to Nabi (Sallallahu Alaihi Wasallam) and complained, “O Nabi (Sallallahu Alaihi Wasallam), the wealthy have learnt about this and they also have began reciting this tasbeeh.” (i.e. they are equal to us in this also, with the virtue of charity remaining exclusive to them).
Nabi (Sallallahu Alaihi Wasallam) replied, “This is the bounty of Almighty Allah Ta’aala. He grants it to whomsoever He pleases.”
(Mishkaat Shareef, Vol 1, Pg 89, Tirmidhi Sharif Vol 1 Pg. 94)