(a) Alqamah bin Wa'il (may Allah have mercy on him) said that Wa'il (may Allah be pleased with him) prayed with the Messenger of Allah (peace and blessings be upon him). When he (peace and blessings be upon him) recited: 'Not of those who have earned (Your) anger, nor of those who go astray' [Surah al-Fatihah: 7], he said Amin and kept his voice low.
(b) Muhammad bin Isma'il al-Bukhari (may Allah have mercy on him) said: Shu'bah is contradicted in this hadith in three things: it is said that Hujr is Abu al-Sakan, and he is Ibn Anbas; he added Alqamah to it, though he is not in it; and he said that he (peace and blessings be upon him) kept his voice low, whereas he (peace and blessings be upon him) raised his voice when saying Amin. Abu Isa al-Tirmidhi reported from al-Bukhari that the hadith of Sufyan al-Thawri from Salamah on this topic is more correct than the hadith of Shu'bah, and that Shu'bah erred in it; Abu Zur'ah al-Razi said the same.
(c) The Shaykh (may Allah have mercy on him) said: His error in the text is clear. As for his saying that Hujr is Abu al-Anbas, Muhammad bin Kathir (may Allah have mercy on him) also reported it in the same way from al-Thawri (may Allah have mercy on him). As for his narrating it from Alqamah, he made clear in his narration that Hujr heard it from Alqamah, and he also heard it from Wa'il himself. Abu al-Walid al-Tayalisi narrated it from Shu'bah like the narration of al-Thawri.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2447