What is the evidence for offering the prayer for rain (salaat al-istisqa’)?

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Ruling on one who catches up with the tashahhud with the imam in Eid prayer or prayers for rain
Praying in Hijr Ismaa‘eel

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Related Answers:
Turning one’s rida’ inside out should be done during the khutbah of istisqa’ when the imam turns his rida’ inside out.
Should he fast on the fifteenth of Sha’baan even if the hadeeth is da'eef?
The time of Taraaweeh prayer
Ruling on one who catches up with the tashahhud with the imam in Eid prayer or prayers for rain
Praying in Hijr Ismaa‘eel

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