Al-Kāfi
Hadith 484 8ـ وَبِهَذَا الاسْنَادِ عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُعَمَّرِ بْنِ خَلادٍ قَالَ سَأَلَ رَجُلٌ فَارِسِيٌّ أَبَا الْحَسَنِ (عَلَيْهِ السَّلام) فَقَالَ طَاعَتُكَ مُفْتَرَضَةٌ فَقَالَ نَعَمْ قَالَ مِثْلُ طَاعَةِ عَلِيِّ بْنِ أَبِي طَالِبٍ (عَلَيْهِ السَّلام) فَقَالَ نَعَمْ.
8. Through the same chain of narrators it is narrated from Ahmad ibn Muhammad from Mu‘ammar ibn Khallad who has said that a man from Persia asked Imam abu al-Hassan (a.s.) “Is obedience to you obligatory?” The Imam (a.s.) replied, “Yes, it is obligatory.” The man then asked is in the same way as obedience to Amir al-Mu’minin Ali ibn abu Talib (a.s.)?” The Imam (a.s.) replied “Yes, it is obligatory in the same way,”