Shaykh al-Tusi & Sayyid Ibn Tawus narrated that al-Mufadhdhal ibn Umar said that he heard Imam Jafar as-Sadiq (as) saying the following after the Jafar at Tayyars Prayer
يَا رَبِّ يَا رَبِّ
ya rabbi ya rabbi
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يَا رَبَّاهُ يَا رَبَّاهُ
ya rabbahu ya rabbahu
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رَبِّ رَبِّ
rabbi rabbi
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يَا اللَّهُ يَا اللَّهُ
ya allahu ya allahu
يَا حَيُّ يَا حَيُّ
ya hayyu ya hayyu
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يَا رَحِيمُ يَا رَحِيمُ
ya raheemu ya raheemu
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يَا رَحْمٰنُ يَا رَحْمٰنُ
ya rahmanu ya rahmanu
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يَا ارْحَمَ ٱلرَّاحِمِينَ
ya arhama alrrahimeena