Abu Darda on Dhikr: The heart is purified by remembering Allah

Rabia reported: Abu Darda, may Allah be pleased with him, said, “Verily, everything has a polish and the polish of the heart is the remembrance of Allah Almighty.”

Source: Shu’ab al-Imān 503

Ibn Al-Qayyim said, “The heart is tarnished by two matters: negligence and sin. And it is polished by two matters: seeking forgiveness and the remembrance of Allah.”

Source: al-Wābil al-Ṣayyib 1/40

عَنْ رَبِيعَةَ قَالَ قَالَ أَبُو الدَّرْدَاءِ رَضِيَ اللَّهُ عَنْهُ إِنَّ لِكُلِّ شَيْءٍ جِلاءً وَإِنَّ جِلاءَ الْقُلُوبِ ذِكْرُ اللَّهِ عَزَّ وَجَلَّ

503 شعب الإيمان للبيهقي العاشر من شعب الإيمان

قال ابن القيم وصدأ القلب بأمرين بالغفلة والذنب وجلاؤه بشيئين بالاستغفار والذكر

1/40 الوابل الصيب من الكلم الطيب