Abdullah ibn Mas’ud reported: The Messenger of Allah, peace and blessings be upon him, said, “He will not enter Hellfire who has the weight of a seed of faith in his heart and he will not enter Paradise who has the weight of a seed of arrogance in his heart.”

Source: Sahih Muslim 91

Grade: Sahih (authentic) according to Muslim

عَنْ عَبْدِ اللَّهِ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا يَدْخُلُ النَّارَ أَحَدٌ فِي قَلْبِهِ مِثْقَالُ حَبَّةِ خَرْدَلٍ مِنْ إِيمَانٍ وَلَا يَدْخُلُ الْجَنَّةَ أَحَدٌ فِي قَلْبِهِ مِثْقَالُ حَبَّةِ خَرْدَلٍ مِنْ كِبْرِيَاءَ

91 صحيح مسلم كتاب الإيمان باب تحريم الكبر وبيانه