Al-Kāfi

Hadith 1766
repentance
3ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ يَاسِرٍ عَنِ الرِّضَا (عَلَيهِ السَّلام) قَالَ مَثَلُ الإسْتِغْفَارِ مَثَلُ وَرَقٍ عَلَى شَجَرَةٍ تُحَرَّكُ فَيَتَنَاثَرُ وَالْمُسْتَغْفِرُ مِنْ ذَنْبٍ وَيَفْعَلُهُ كَالْمُسْتَهْزِئِ بِرَبِّهِ.
3. Ali ibn Ibrahim has narrated from his father from Yasir from al-Rida (a.s.) who has said the following: “A plea for forgiveness is like shaking a tree from which leaves fall off. One who pleas forgiveness and commits sins is like one who derides his Lord.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī