Sahih Muslim #36

الإِيمَانُ بِضْعٌ وَسَبْعُونَ شُعْبَةً فَأَفْضَلُهَا قَوْلُ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَدْنَاهَا إِمَاطَةُ الأَذَى عَنِ الطَّرِيقِ وَالْحَيَاءُ شُعْبَةٌ مِنَ الإِيمَانِ

The Messenger of Allah (ﷺ) said: 'Faith has over seventy branches, the highest of which is the declaration that there is no god but Allah, and the lowest of which is the removal of a harmful object from the road, and modesty is a branch of faith.'