Sahih Muslim
The Book of Faith (Kitab Al-Iman)
Book Number: 001 / Hadith Number: 164
It Is narrated on the authority of Abdullah b. Mas'ud that the Apostle of Allah (may peace be upon him), observed: He who has in his heart the weight of a mustard seed of pride shall not enter Paradise. A person (amongst his hearers) said: Verily a person loves that his dress should be fine, and his shoes should be fine. He (the Holy Prophet) remarked: Verily, Allah is Graceful and He loves Grace. Pride is disdaining the truth (out of self-conceit) and contempt for the people.