The Prophet (sallallahu alayhi wa sallam) stood in humble supplication for a month and then gave it up.
وَعَنْ أَنَسٍ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَنَتَ شَهْرًا ثُمَّ تَرَكَهُ
The Prophet (sallallahu alayhi wa sallam) stood in humble supplication for a month and then gave it up.
Who passed it on, from Al-Khatib at-Tibrizi back to the one who was there.
The same words, in another collection.
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