Ibn al-Qayyim رحمة الله:

Allāh ﷻ says: [interpretation of the meaning]

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❝O you who have believed, remember Allāh with much remembrance, And exalt Him morning and afternoon.❞

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[Qur’ān 33:41-42]

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➤ Remembrance of Allāh ﷻ polishes the heart

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It was narrated by Mu’ādh Ibn Jabal – may Allāh be pleased with him – that The Prophet ﷺ said:

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❝For everything there is a polish, and the polish for the hearts is the dhikr [remembrance] of Allāh. There is nothing more potent in saving a person from the punishment of Allāh than the dhikr of Allāh. It was said: Not even Jihād in the path of Allāh. So he replied: Not even if you were to continue striking with your sword until it breaks❞

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[Musnad Ahmad 4/352 authenticated by al-Albanī]

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Abu Darda – may Allāh be pleased with him – said:

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❝Verily, everything has a polish and the polish of the heart is the remembrance of Allāh the Exalted.❞

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[Shu’ab al-Imān 503]

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Ibn al-Qayyīm – may Allāh have mercy upon him said:

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❝There is no doubt that the heart becomes covered with rust, just as metal dishes – silver, and their like – become rusty.

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So the rust of the heart is polished with dhikr, for dhikr polishes the heart until it becomes like a shiny mirror.

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However, when dhikr is abandoned, the rust returns; and when it commences then the heart again begins to be cleansed.

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Thus the heart becoming rusty is due to two matters: sins and neglecting remembrance of Allāh. Likewise, it is cleansed and polished by two things: istighfār and dhikr.❞

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[Al-Wābil As-Sayyib, p.80]

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And Allāh ﷻ knows best