Hadith 567
فضلت سورة الحج بان فيها سجدتين؟ قال نعم ومن لم يسجدهما فلا يقراهما
"Was Surah Al-Hajj given superiority because it contains two prostrations?" The Prophet (peace be upon him) said: "Yes, and whoever does not perform both prostrations should not recite them."