Sunan an-Nasa'i · Hadith 1247
أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، قَالَ أَنْبَأَنَا عَبْدُ اللَّهِ، عَنِ ابْنِ عَوْنٍ، عَنْ إِبْرَاهِيمَ، قَالَ كَانُوا يَقُولُونَ إِذَا أَوْهَمَ يَتَحَرَّى الصَّوَابَ ثُمَّ يَسْجُدُ سَجْدَتَيْنِ .
It was narrated that Ibrahim said:"They used to say: 'If one is not sure of what he estimates is correct, then prostrate twice
Sahih Isnaad Mauquf · Abu GhuddahSahih Isnaad Mauquf · Al-AlbaniIsnaad Sahih · Zubair Ali Zai