١ of two
A remembrance asking directly for a firm heart - steadiness in faith is something to ask for, not something you're expected to already have secured
يَا مُقَلِّبَ الْقُلُوْبِ ثَبِّتْ قَلْبِيْ عَلَىٰ دِيْنِكَ
O Changer of the hearts, make my heart firm upon Your religion.
Scholarly reviewed
Tirmidhī 3522