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.' "
USC-MSA web (English) reference: Book 47, Hadith 9
Arabic reference: Book 47, Hadith 1644