الكافي- ط الاسلامية, volume 3, page 350

2. Al-Husayn ibn Muhammad has narrated from ‘Abd Allah ibn ‘Amir from Ali ibn Mahziyar from al-Husayn ibn Sa‘id from Zur‘ah ibn Muhammad from Santa ‘ah who has said the following: “He (the Imam) (a.s.), has said, ‘If one doubts in the first two Rak‘at of al-Dhuhr, al-‘Asr and al-‘Atmah and does not know he has performed one or two, he must perform his Salah (prayer) again.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

3. Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan and Ali ibn Ibrahim has narrated from his father from all from Hammad ibn ‘Isa from Hariz from Zurarah who has said the following: “I once said to one of the two Imam (a.s.), ‘There is a man who does not know if he has performed one or two. He (the Imam) said, ‘He performs his Salah (prayer) again.’ I then asked, ‘There is a man who does not know if he has performed two or three. He (the Imam) said, ‘If he doubts after entering the third Rak‘at, he continues his Salah (prayer), then performs one more (Rak‘at); and he is not obligated for anything in this matter and he says the phrase of offering greeting of peace.’ I then asked, ‘One does not know if it is the second or fourth (Rak‘at).’ He (the Imam) said, ‘He says the phrase of offering greeting of peace and performs two Rak‘at, says the phrase of offering greeting of peace and he is not obligated for anything in this matter.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from al-Hassan ibn Ali al-Washsha’ and al-Husayn ibn Muhammad from Mu‘alla’ ibn Muhammad from al-Hassan ibn Ali al-Washsha’ who has said the following: “Abu al-Hassan, al-Rida (a.s.), once said to me, ‘In the first two Rak‘at it is performing again and confusion in the second two Rak‘at (has remedies).”’

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.

1. Ali ibn Ibrahim has narrated from his father from and Muhammad ibn ’Isma‘il from af-Fadf ibn Shadhan all from Ibn Abi ‘Umayr from Hafs ibn al-Bakhtariy and others who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If you doubt in al-Maghrib Salah (prayer) perform it again. If you doubt in the morning Salah (prayer) perform it again.’”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.