I went to the city of Madina and stood in front of his door...

I went to the city of Madina and stood in front of his door and said to his slave, ‘Tell your master that a man from Iraq is at the door.’” He has said that I heard his voice saying, “O ‘Abdallah ibn Mughira, come in.” I then went inside and when he looked at me he said, “Allah has answered your prayer and has guided you to His religion.” I then said, “I testify that you possess Divine Authority and you are the trustee of Allah over His creatures.” :

وثق وفي أول السند إرسا ل - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (4/103)) صحيح - Shaykh Baqir al-Behbudi (Sahih al-Kafi (1/41))