I have heard and read many times that reading Dua Ahad for forty mornings after Namaz e Fajr will for sure be in serving Imam Mehdi army. I tried many times but one or other day I missed but still I would recite in zuhr. My question is do reading dua ahad even on zuhr or any other time will help joining Imam army please?

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The dua can be said anytime but to attain what the narration mentioned it says the mornings.