Reported by Abu Dharr (Radiyallaahu `anhu) that the Messenger of Allah (Sallallaahu `alayhi wa sallam) said,
“Do not belittle any good deed, even your meeting your brother with a cheerful face.”

On the Authority of Abu Hurayrah (Radiyallaahu `anhu) that the Messenger of God (Sallallaahu `alayhi wa sallam) once exclaimed,
“By God, he is not a believer!
By God, he is not a believer!
By God, he is not a believer!”

Narrated by Abdullah ibn Mas’ud (Radiyallaahu `anhu) that the Messenger of Allah (Sallallaahu `alayhi wa sallam) said,
“A believer does not taunt, curse, abuse or talk indecently.”