Narrated Asma (Radi-Allahu 'anha):

Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) said, "Give (in charity) and
do not give reluctantly lest Allah should give you in a limited amount; and
do not withhold your money lest Allah should withhold it from you."

Bukhari Vol. 3 : No. 764