Dua For Firmness of the Heart
يَا مُقَلِّبَ الْقُلُوْبِ ثَبِّتْ قَلْبِيْ عَلَىٰ دِيْنِكَ
Translation :
O Changer of the hearts, make my heart firm upon Your religion.
Transliteration :
Yā Muqalliba-l-qulūbi thabbit qalbī ʿalā dīnik.
Hadith:
Anas (raḍiy Allāhu ‘anhu) said: “The Messenger of Allah ﷺ would often say [the above]. So I asked: ‘O Messenger of Allah, we believe in you and what you have come with, but do you fear for us?’ He replied: ‘Yes. Indeed the hearts are in between the two Fingers of Allah’s Fingers. He changes them as He wills.”’ (Tirmidhī 3522)