Yahya related to me from Malik from Salama ibn Safwan ibn Salama az-Zuraqi that Zayd ibn Talha ibn Rukana, who attributed it to the Prophet ﷺ said, "The Messenger of Allah ﷺ said, 'Every deen has an innate character. The character of Islam is modesty.' "
عَنْ زَيْدِ بْنِ طَلْحَةَ بْنِ رُكَانَةَ يَرْفَعُهُ إِلَى النَّبِيِّ ﷺ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ لِكُلِّ دِينٍ خُلُقٌ وَخُلُقُ الإِسْلاَمِ الْحَيَاءُ