Hadith on Mercy: Believers eventually taken out of Hellfire

Anas ibn Malik reported: The Prophet, peace and blessings be upon him, said, “One will be taken out of the Hellfire who said there is no God but Allah and he had good in his heart like the weight of a grain of barley. Then, one will be taken out of Hellfire who said there is no God but Allah and he had good in this heart like the weight of a grain of wheat. Then, one will be taken out of Hellfire who said there is no God but Allah and he had good in his heart like the weight of a speck.

Source: Ṣaḥīḥ al-Bukhārī 44, Ṣaḥīḥ Muslim 193

Grade: Sahih (authentic) according to Muslim

عَنْ أَنَسٍ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ يَخْرُجُ مِنْ النَّارِ مَنْ قَالَ لَا إِلَهَ إِلَّا اللَّهُ وَكَانَ فِي قَلْبِهِ مِنْ الْخَيْرِ مَا يَزِنُ شَعِيرَةً ثُمَّ يَخْرُجُ مِنْ النَّارِ مَنْ قَالَ لَا إِلَهَ إِلَّا اللَّهُ وَكَانَ فِي قَلْبِهِ مِنْ الْخَيْرِ مَا يَزِنُ بُرَّةً ثُمَّ يَخْرُجُ مِنْ النَّارِ مَنْ قَالَ لَا إِلَهَ إِلَّا اللَّهُ وَكَانَ فِي قَلْبِهِ مِنْ الْخَيْرِ مَا يَزِنُ ذَرَّةً

44 صحيح البخاري كتاب الإيمان باب زيادة الإيمان ونقصانه

193 صحيح مسلم كتاب الإيمان باب أدنى أهل الجنة منزلة فيها