Hisham ibn Hassan reported: Al-Hasan al-Basri, may Allah have mercy on him, said, “Verily, a man may commit a sin and he never forgets it, always fearing it, until he enters Paradise.”
Source: al-Zuhd li-Aḥmad ibn Ḥanbal 1581
عَنِ هِشَام بْن حَسَّان عَنِ الحسن البصري رحمه الله قَالَ إِنَّ الرَّجُلَ يُذْنِبُ الذَّنْبَ فَمَا يَنْسَاهُ وَمَا يَزَالُ مُتَخَوِّفًا مِنْهُ حَتَّى يَدْخُلَ الْجَنَّةَ
1581 الزهد لأحمد بن حنبل