Man Lā Yaḥḍuruh al-Faqīh
Hadith 10201025 - وَ رُوِيَ عَنْ إِسْحَاقَ بْنِ عَمَّارٍ أَنَّهُ قَالَ: قَالَ لِي أَبُو اَلْحَسَنِ اَلْأَوَّلُ عَلَيْهِ اَلسَّلاَمُ «إِذَا شَكَكْتَ فَابْنِ عَلَى اَلْيَقِينِ» قَالَ قُلْتُ هَذَا أَصْلٌ قَالَ «نَعَمْ.
Hadith.1025 - It is narrated from Ishaq ibn Ammar who said:
"Abul Hasan al-Awwal (as) said to me: 'When you are in doubt, rely on what you are certain of.'
I said: 'Is this a principle?'
Imam (as) said: 'Yes.'