Hadith 504860
Chapter 15: The Qur'an - كتاب القرآن
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، أَنَّهُ قَالَ رَأَيْتُ عَبْدَ اللَّهِ بْنَ عُمَرَ يَسْجُدُ فِي سُورَةِ الْحَجِّ سَجْدَتَيْنِ .
Yahya related to me from Malik that Abdullah ibn Dinar said, "I saw Abdullah ibn Umar prostrate twice in Surat al-Hajj (Sura 22)."
Reference Muwatta Malik 504860
USC-MSA web (English) reference : Book 15, Hadith 14