حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّهُ كَانَ يَقُولُ فِي الشَّفَتَيْنِ الدِّيَةُ كَامِلَةً فَإِذَا قُطِعَتِ السُّفْلَى فَفِيهَا ثُلُثَا الدِّيَةِ ‏.‏

Yahya related to me from Malik from Ibn Shihab that Said ibn al-Musayyab used to say, "The full blood-money is payable for cutting offboth lips, but when the lower one only is cut off, two-thirds of theblood-money is due for it." Translation Not Available

Book Ref: Muwatta Imam Malik Book 43 Hadith 1567
Web Ref:  Muwatta Imam Malik Book 43 Hadith 6