In the name of Allah, Most Gracious, Most Merciful.
Abdullah bin Mas’ud (May Allah be pleased with him) reported: The Prophet (SAWS) said, “He who has, in his heart, an ant’s weight of arrogance will not enter Jannah.” Someone said: “A man likes to wear beautiful clothes and shoes?” The Messenger of Allah (SAWS) said, “Allah is Beautiful, He loves beauty. Arrogance means ridiculing and rejecting the Truth and despising people.” (Muslim).
SAWS: May Allah exalt his mention and protect him from imperfection
Commentary: The Hadith says that a man who has even an iota of pride in his heart will be barred from entering Jannah. The Hadith word used for the smallest amount means in Arabic either the smallest ant or the particle which is radiated by sun-rays and seen through a wall-chink. Obviously, such a particle has almost a non-existent amount, but even this much is disapproved by Allah. If pride incites a man to deny the existence of Allah and His Revelation, he is sure to be thrown into Hell. He also faces Divine displeasure and the danger of infernal fire if mere consideration of riches, physical beauty, social and intellectual prominence and family status makes him proud and self-conceited and he looks down upon others, or persists in the denial of Truth.
[1]: Audio lecture on pride and arrogance can be downloaded here.
Riyaadiss-Saliheen (The Meadows of the Righteous)
By Imam An Nawawi
Chapter 72, Page 199, No 612