The Prophet Muhammad (peace be upon him) quoted God as saying: "My love is obliged to those who love each other for My sake, who sit with each other for My sake, who visit each other for My sake, and who give to each other generously for My sake."

Al-Muwattah, Volume 51, Hadith 15

The Prophet Muhammad (peace be upon him) said: “Charity is prescribed for each descendant of Adam every day the sun rises.” He was then asked: “From what do we give charity every day?” The Prophet answered: “The doors of goodness are many…enjoining good, forbidding evil, removing harm from the road, listening to the deaf, leading the blind, guiding one to the object of his need, hurrying with the strength of one’s legs to one in sorrow who is asking for help, and supporting the feeble with the strength of one’s arms–all of these are charity prescribed for you.” He also said: “Your smile for your brother is charity.“ – Fiqh-us-Sunnah, Volume 3,