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Salat-l-Istikhara is described in the Hadith narration below.
Narrated Jabir bin ‘Abdullah: The Prophet salallahu alaihi wasallam used to teach us the way of doing istikhara (istikhara means to ask Allah to guide one to the right sort of action concerning any job or a deed), in all matters as he taught us the Surats of the Quran. He said, “If anyone of you thinks of doing any job he should offer a two Rakat prayer other than the compulsory ones and say (after the prayer):