قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم  “أَفَلاَ أُخْبِرُكُمْ بِمَا يُذْهِبُ وَحَرَ الصَّدْرِ” قَالُوا بَلَى ‏.‏ قَالَ صِيَامُ ثَلاَثَةِ أَيَّامٍ مِنْ كُلِّ شَهْرٍ

سنن النسائي ٢٣٨٦ صحيح

The messenger of Allah (ﷺ) may Allah send peace and blessings upon him said: “Shall I not inform you of what removes the impurity from the heart” they said “Yes” he said “fasting three days every month”

Sunan An Nasa’i 2386 Saheeh

:قال السِّنْدِيِّ

( بِمَا يُذْهِبُ وَحَرَ الصَّدْرِ )

“قِيلَ غِشُّهُ وَوَسَاوِسُهُ وَقِيلَ حِقْده وَقِيلَ مَا يَحْصُلُ فِي الْقَلْبِ مِنْ الْكُدُورَاتِ وَالْقَسْوَة”

شرح سنن النسائي –  (ج 3 / ص 444)

As Sindhi said:

“what removes the impurity from the heart”

“It is said: it’s deceitfulness, and its whispers, and it is said: hatred, and it is said what comes in the heart from troubles and hardness.”

Explanation of sunan Nasa’i