Abu Ad-Darda reported: The Messenger of Allah, peace and blessings be upon him, said:
أَلَا أُخْبِرُكُمْ بِأَفْضَلَ مِنْ دَرَجَةِ الصِّيَامِ وَالصَّلَاةِ وَالصَّدَقَةِ
Shall I not tell you about what is more virtuous in degree than fasting, prayer, and charity?
They said, Of course!” The Prophet said:
صَلَاحُ ذَاتِ الْبَيْنِ فَإِنَّ فَسَادَ ذَاتِ الْبَيْنِ هِيَ الْحَالِقَةُ
It is reconciliation between people. Verily, corrupted relations between people are the razor.
In another narration, the Prophet added:
هِيَ الْحَالِقَةُ لَا أَقُولُ تَحْلِقُ الشَّعَرَ وَلَكِنْ تَحْلِقُ الدِّينَ
It is the razor. I do not say that it shaves hair, but rather it shaves the religion.
Source: Sunan At-Tirmidhi