وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سَلَمَةَ بْنِ صَفْوَانَ بْنِ سَلَمَةَ الزُّرَقِيِّ، عَنْ زَيْدِ بْنِ طَلْحَةَ بْنِ رُكَانَةَ، يَرْفَعُهُ إِلَى النَّبِيِّ صلى الله عليه وسلم قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لِكُلِّ دِينٍ خُلُقٌ وَخُلُقُ الإِسْلاَمِ الْحَيَاءُ ‏"‏ ‏.‏

Yahya related to me from Malik from Salama ibn Safwan ibn Salamaaz-Zuraqi that Zayd ibn Talha ibn Rukana, who attributed it to theProphet, may Allah bless him and grant him peace, said, "The Messengerof Allah, may Allah bless him and grant him peace, said, 'Every deenhas an innate character. The character of Islam is modesty.' " Translation Not Available

Book Ref: Muwatta Imam Malik Book 47 Hadith 1644
Web Ref:  Muwatta Imam Malik Book 47 Hadith 9