وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ، أَنَّهُ أَخْبَرَهُ أَنَّ ‏{‏قُلْ هُوَ اللَّهُ أَحَدٌ‏}‏ تَعْدِلُ ثُلُثَ الْقُرْآنِ وَأَنَّ ‏{‏تَبَارَكَ الَّذِي بِيَدِهِ الْمُلْكُ‏}‏ تُجَادِلُ عَنْ صَاحِبِهَا ‏.‏

Yahya related to me from Malik from Ibn Shihab that Humayd ibnAbd ar-Rahman ibn Awf had told him that Surat al-Ikhlas (Sura 112) wasequal to a third of the Qur'an, and that Surat al-Mulk (Sura 67)pleaded for its owner. Translation Not Available

Book Ref: Muwatta Imam Malik Book 15 Hadith 491
Web Ref:  Muwatta Imam Malik Book 15 Hadith 19