Hazrat Shahr bin Jaushab (radhiallaho anho) says: “I asked Umme Salma (radhiallaho anha) ‘What was the dua most often read by Rasulullah (sallellaho alaihe wasallam) in his house?’ She replied that Rasulullah (sallellaho alaihe wasallam) used to read:

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O the Controller of hearts! Make my heart firm on Your Deen.(Tirmizi)

Dua for Following the Truth and Abstaining From Falsehood

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O Allah! Enable me to see the Truth as Truth and give me the ability to follow it. And enable me to see the falsehood as false and give me the ability to refrain from it.

(Tafseer ibne Katheer vol.1 pg.292 verse 213)

It is clearly understood from the above that it is not sufficient to merely recognize the Truth. It is also necessary to practice upon it. If one recognizes the Truth but does not practice upon it, one will be a criminal. Likewise, it is not sufficient to recognize what is evil. It is also necessary to refrain from it. Sometimes one recognizes the evil. He understands that it is a sin, yet he does not refrain from it. He too is a criminal. It is the eloquence of the speech of Rasulullah (sallellaho alaihe wasallam), that in such short words, such an eloquent and comprehensive message is delivered.

One who continuously recite this dua, will Inshallah be able to distinguish between good and evil, and he will receive the ability to practice on the good and refrain from the evil.