Narrated on the authority of ‘Abdullah b. Mas’ud (Radiyallaahu `anhu) that the Messenger of Allah (Sallallaahu `alayhi wa sallam) observed,
“None shall enter the Fire (of Hell) who has in his heart the weight of a mustard seed of Iman and none shall enter Paradise who has in his heart the weight of a mustard seed of pride.”

It is narrated on the authority of Abu Huraira that the Prophet (Sallallaahu `alayhi wa sallam) said,
“Iman has over seventy branches, and modesty is a branch of Iman.”