We have been commanded to recite this Dua regularly. Shaykh Sadooq narrates from Abdullah bin Sinan who says that Imam Sadiq (as) said, “After this a time of such doubt will befall you that you will be without the visible signs and a guiding Imam. And no one shall be able to achieve salvation from this except those who recite “Dua-e-Ghareeq.” (Supplication of the drowning man).
The narrator asked what this Dua was? Imam (as) replied,
“O Allah! O Beneficent! O Merciful! O the One Who transforms the hearts! Make my heart steadfast upon your religion!”
The narrator repeated the Dua in this way:
The narrator added "مُقَلِبَ القُلُوبِ و الأبصار" Imam (as) told him, "Indeed, Allah is مُقَلِبَ القُلُوبِ و الأبصار", but you say only "يا مقلب القلوب ثبِّت قلبي على دينك".
O Allah! O Beneficent! O Merciful. O One who changes the hearts (of people) Give me steadfastness upon Your religion.
After repeating ‘Muqallebal Quloob’ the narrator added the word, ‘Wal absaar’ (and the vision). When Imam (as) heard this, he said, “Indeed Allah is the One Who changes the hearts and vision, but you recite the Dua as I have said.”1
Shaykh Nomani in his book, Ghaibah, has through his own chain of narrators related from Hammad bin Isa from Abdullah bin Sinan that he said: My father and I went to Abu Abdillah as-Sadiq (as). He said: “What will you do if you see a time when you do not find an Imam of guidance not any banner and then no one will be saved from that confusion except one, who will recite the supplication of the drowning one (Dua Ghareeq)?” My father said, “By Allah, this is a great calamity. May I be sacrificed on you, what shall we do then?” He said, “If that occurs - and you will not attain it – then keep to that which you have had until the matter becomes clear.”2