قَالَ اَبُو جَعْفَرٍ ع قَالَ رَسُولُ اللهِ ص اِنَّ حَدِيثَ آلِ مُحَمَّدٍ صَعْبٌ مُسْتَصْعَبٌ لَا يُؤْمِنُ بِهِ اِلَّا مَلَكٌ مُقَرَّبٌ اَوْ نَبِيٌّ مُرْسَلٌ اَوْ عَبْدٌ امْتَحَنَ اللهُ قَلْبَهُ لِلْاِيمَانِ فَمَا وَرَدَ عَلَيْكُمْ مِنْ حَدِيثِ آلِ مُحَمَّدٍ ص فَلَانَتْ لَهُ قُلُوبُكُمْ وَ عَرَفْتُمُوهُ فَاقْبَلُوهُ وَ مَا اشْمَاَزَّتْ مِنْهُ قُلُوبُكُمْ وَ اَنْكَرْتُمُوهُ فَرُدُّوهُ اِلَى اللهِ وَ اِلَى الرَّسُولِ وَ اِلَى الْعَالِمِ مِنْ آلِ مُحَمَّدٍ وَ اِنَّمَا الْهَالِكُ اَنْ يُحَدِّثَ اَحَدُكُمْ بِشَيْءٍ مِنْهُ لَا يَحْتَمِلُهُ فَيَقُولَ وَ اللهِ مَا كَانَ هَذَا وَ اللهِ مَا كَانَ هَذَا وَ الْاِنْكَارُ هُوَ الْكُفْرُ.
Imam Abu Ja’far (peace be upon him) says that the Messenger of Allah (peace be upon him and his holy progeny) declared, “Verily the traditions of Aale Muhammad (peace be upon him) are difficult and complex. None will believe in them except a proximate angel or a sent messenger or a servant whose heart has been tested by Allah for faith. So whenever a hadees from Aale Muhammad (peace be upon him) comes to you towards which your hearts are inclined and you are cognizant of it, accept it. But if your hearts tremble on hearing it and you dislike it, refer it to Allah, the Messenger and the Knowledgeable from the Aale Muhammad (peace be upon him). Verily, he is destroyed who on hearing such a hadees cannot bear it and says, ‘By Allah! This is not the truth, By Allah! This is not the truth.’ Denying is disbelief.”
References:
1. Al-Kaafi, vol. 1, p. 401, H. 1
2. Al-Burhan fee Tafseer al-Quran, vol. 5, p. 858, H. 14089
3. Behaar al-Anwaar, vol. 2, p. 189, H. 21
4. Fragrance of Mastership H. 4