Hadith: Faith has over seventy branches - or over sixty branches - the most excellent of which is the declaration that 'lā ilāha illa Allah (there is no god but Allah)', and the lowest of which is the removal of what is harmful from the way

عن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم:
«الْإِيمَانُ بِضْعٌ وَسَبْعُونَ -أَوْ بِضْعٌ وَسِتُّونَ- شُعْبَةً، فَأَفْضَلُهَا قَوْلُ لَا إِلَهَ إِلَّا اللهُ، وَأَدْنَاهَا إِمَاطَةُ الْأَذَى عَنِ الطَّرِيقِ، وَالْحَيَاءُ شُعْبَةٌ مِنَ الْإِيمَانِ».
[صحيح] - [متفق عليه] - [صحيح مسلم: 35]

Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said:
"Faith has over seventy branches - or over sixty branches - the most excellent of which is the declaration that 'lā ilāha illa Allah (there is no god but Allah)', and the lowest of which is the removal of what is harmful from the way; and modesty is a branch of faith."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Muslim - 35]

Explanation

The Prophet (may Allah's peace and blessings be upon him) informs that faith consists of many branches and elements comprising various deeds, beliefs, and words.
And he states that the best and most sublime among the elements of faith is to say "there is no god but Allah" while knowing its meaning and acting according to it - that Allah is the One true God Who is worthy of worship, alone, and apart from all else.
And that the lowest act of faith is to remove any object harmful to people from their ways.
Then, the Prophet (may Allah's peace and blessings be upon him) informed that modesty is one of the elements of faith, and it is a character trait that prompts one to do what is good and deters him from doing what is evil.