(a) Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said: I asked the Messenger of Allah (peace and blessings be upon him): O Messenger of Allah, are there two prostrations in Surah al-Hajj? He (peace and blessings be upon him) said: "Yes. Whoever does not perform them should not recite them at all."
(b) It is narrated from Khalid bin Ma'dan (may Allah have mercy on him) that he (peace and blessings be upon him) said: "Surah al-Hajj has been given superiority over the rest of the Qur'an by two prostrations."
(c) Imam al-Bayhaqi (may Allah have mercy on him) said: Amr bin al-Harith and a group of senior narrators narrated this report from Ibn Lahi'ah.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3728