الكافي- ط الاسلامية, volume 3, page 381

1. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan from ‘Abd al- Rahman ibn al-Hajjaj who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who joins the congregation in the second Rak‘at which is the first for him. What is he to do when the Imam sits down? He (the Imam) said, ‘He displays readiness to stand up (by raising his knees from the ground and placing his palms on the ground), does not allow himself to sit down. When it is the third Rak‘at for the Imam and the second for him, he waits a little while to say Tashahhud (testimonies of belief), then joins the Imam? He (the narrator) has said that he then asked him (the Imam) about one who joins a congregation in the two last Rak‘at of Salah (prayer) and what is one to do about recitation. He (the Imam) said, ‘Recite in them; they are the first two Rak‘at for you and do not make the beginning of your Salah (prayer) its end.’”

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

2. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from Ibn Abi ‘Umayr from Jamil ibn Darraj from Muhammad ibn Muslim who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If you cannot join in Takbir (Allah is great beyond description) for Ruku‘ (bowing down on one’s knees) do not enter (congregational Salah (prayer)) in that Rak‘at.’”

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

3. Ali ibn Muhammad and Muhammad ibn al-Hassan have narrated from Sahl ibn Ziyad from Ahmad ibn Muhammad from ibn abu Nasr from al-Mithamiy from Ishaq ibn Yazid who has said the following: “I once said to abu ‘Abd Allah (a.s.), I pray to Allah to keep my soul in service for your cause, the Imam is one Rak‘at ahead of me which is the first for me and the second for him. Do I say Tashahhud (testimonies of belief) when I sit down? He (the Imam) said, ‘Yes, Tashahhud (testimonies of belief) is but a blessing.’”

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

4. Muhammad ibn Yahya has narrated from ‘Abd Allah ibn Muhammad ibn ‘Isa from Ali ibn al-Hakam from Aban ibn ‘Uthman from ‘Abd al- Rahman ibn abu ‘Abd Allah who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If the Imam is one Rak‘at ahead and you join in the last recitation, recite in the third Rak‘at for him which is the second for you. You must do so even if you cannot join him for more than one Rak‘at in which you recited as well as in the one that follows. If he is one Rak‘at ahead of you, sit down in the second Rak‘at for you and the third for him until the row stand up in line.’ He (the narrator) has said that he (the Imam) said, ‘If you find the Imam in Sajdah (prostration) remain where you are until he raises his head, and if he is sitting, you also sit down, and if he is standing, stand up.’”

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