Mishkat al-Masabih #1223
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَنَسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَنَتَ شَهْرًا ثُمَّ تَرَكَهُ. رَوَاهُ أَبُو دَاوُد وَالنَّسَائِيّ
Anas said that the Prophet stood in humble supplication for a month and then gave it up.
Abu Dawud and Nasa'i transmitted it.
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About Mishkat al-Masabih
This hadith is #1223 from Mishkat al-Masabih, in the Book of Prayer.