Shahr ibn Hawshab (Allah be well-pleased with him) said, “I said to Umm Salama, ‘O Mother of the believers! What was the most frequent supplication of the Messenger of Allah, may Allah bless him and give him peace, when he was with you?’ She said, “His most frequent supplication was, ‘O Turner of the hearts, make my heart firm in Your deen!’” [Tirmidhi]
يا مقلب القلوب ثبت قلبي على دينك
Ya muqallibal-qulubi, thabbit qalbi ‘ala deenika
Frequent supplication of Prophet (salla Llahu ‘alayhi wa sallam)
Aal-e-Qutub Aal-e-Syed Abdullah Shah Ghazi 