Mishkat al-Masabih #882
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عُمَرَ بْنِ الْخَطَّابِ رَضِيَ اللَّهُ عَنْهُ قَالَ: إِنَّ الدُّعَاءَ مَوْقُوفٌ بَيْنَ السَّمَاءِ وَالْأَرْضِ لَا يَصْعَدُ مِنْهُ شَيْءٌ حَتَّى تُصَلِّيَ عَلَى نبيك. رَوَاهُ التِّرْمِذِيّ
‘Umar b. al-Khattab said, “The supplication is stopped between heaven and earth, none of it ascending till you invoke blessing on your Prophet.”
Tirmidhi transmitted it.
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About Mishkat al-Masabih
This hadith is #882 from Mishkat al-Masabih, in the Book of Prayer.