الكافي- ط الاسلامية, volume 3, page 374

5. Ali ibn Muhammad has narrated from Sahl ibn Ziyad from Ali ibn Mahziyar from Ali ibn Rashid who has said the following: “I said to abu Ja‘far (a.s.), ‘You have different friends, thus, I perform Salah (prayer) behind every one of them.’ The Imam said, ‘Do not perform Salah (prayer) behind anyone whom you cannot trust in matters of his religion.’ He then said, ‘I have many friends.’ I said, ‘You have many companions.’ He then immediately, before I could mention their names, said, ‘No, (do not mention their names). Ali ibn Hadid requires you to do this. Is this what Ali ibn Hadid commands you to do?’ I replied, ‘Yes, that is correct.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.

6. Ali ibn Ibrahim has narrated from his father from Hammad from Hariz from Zurarah who has said the following: “I once asked abu Ja’far (a.s.), ‘Certain people have narrated that ’Amir al-Mu’minin performed four Rak‘at after Friday without any interval of saying Salam (the phrase of offering greeting of peace) in between. He (the Imam) said, ‘O Zurarah, ’Amir al-Mu’minin performed Salah (prayer) behind a sinful one. When he said Salam (the phrase of offering greeting of peace) and moved away ’Amir al-Mu’minin stood up, performed four Rak‘at without interval in between by means of saying Salam (the phrase of offering greeting of peace). A man from his side then said, ‘O abu al- Hassan you performed four Rak‘at without interval in between.’ He (’Amir al-Mu’minin)) said, ‘They were four similar Rak‘at’ and remained quiet. By Allah, he did not understand what he said.’”

Translation: Muhammad Sarwar — attributed by Thaqalayn·The Arabic above is the original.