Shaykh al-Islām Ibn Taymiyyah (رحمه الله) said:
“Asking for Allāh’s forgiveness is the most important supplication that a
person can make.”
Jāmi’ al-Masāil, vol 1, pg. 277.
Translated by Musa Shaleem Mohammed
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https://www.salafisounds.com/istighfar-the-key-to-success-khutbah-by-abu-hakeem-bilal-bin-ahmad-davis/
https://www.salafisounds.com/part-2-seeking-forgiveness-istighfar-and-its-role-in-lifting-calamities-and-repelling-hardships-by-abu-iyaad-amjad-rafiq/