كتاب الصلاة
2  
The Book of Prayer
Bulugh al-Maram 344
Narrated Khalid bin Ma'dan (RA):
Surat al-Hajj has been distinguished by two prostrations. [Abu Dawud reported it among al-Marasil (a broken chain after the Tabi'i)].
وَعَنْ خَالِدِ بْنِ مَعْدَانَ ‏- رضى الله عنه ‏- قَالَ : { فُضِّلَتْ سُورَةُ اَلْحَجِّ بِسَجْدَتَيْنِ } .‏ رَوَاهُ أَبُو دَاوُدَ فِي " اَلْمَرَاسِيلِ " .‏ 1
Reference : Bulugh al-Maram 344
In-book reference : Book 2, Hadith 344
English translation : Book 2, Hadith 339
Hadith Text
Reference