Hadith record

7. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ‘Uthman ibn ‘Isa from Sama‘ah who has said the following: “I once asked him (the Imam) (a.s.), about a man who performs Salah (prayer) and has completed only one Rak‘at of an obligatory Salah (prayer) that the Imam arrives. He (the Imam) said, ‘If he is an Imam who possesses the quality of justice, he performs one more Rak‘at, completes and makes it an optional Salah (prayer). He joins the Imam in his Salah (prayer) as is. If he (the Imam) does not have the quality of justice, he (the man) continues with his Salah (prayer) as is. He performs one more Rak‘at with him (the Imam) and sits down for a time within which one can say: I testify that only Allah deserves worship, He is one and has no partners and I testify that Muhammad is His servant and Messenger. He then completes his Salah (prayer) with him as possibly he can; Taqiyah (fear) provides great chances and there is nothing performed in Taqiyah for which one is not rewarded by the will of Allah.’”

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