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