The Prophet ﷺ said: Shall I not inform you of something more excellent in degree than fasting, prayer and almsgiving (sadaqah)? The people replied: Yes, Prophet of Allah! He said: It is putting things right between people, spoiling them is the shaver (destructive).  

قَالَ رَسُولُ اللَّهِ ﷺ أَلاَ أُخْبِرُكُمْ بِأَفْضَلَ مِنْ دَرَجَةِ الصِّيَامِ وَالصَّلاَةِ وَالصَّدَقَةِ قَالُوا بَلَى قَالَ إِصْلاَحُ ذَاتِ الْبَيْنِ وَفَسَادُ ذَاتِ الْبَيْنِ الْحَالِقَةُ  

The Prophet ﷺ said: He who forged in order to put things right between two persons did not lie. The version by Ahmad ibn Muhammad and Musaddad has: The liar is not the one who puts things right between people, saying what is good and increasing good.  

أَنَّ النَّبِيَّ ﷺ قَالَ لَمْ يَكْذِبْ مَنْ نَمَى بَيْنَ اثْنَيْنِ لِيُصْلِحَ وَقَالَ أَحْمَدُ بْنُ مُحَمَّدٍ وَمُسَدَّدٌ لَيْسَ بِالْكَاذِبِ مَنْ أَصْلَحَ بَيْنَ النَّاسِ فَقَالَ خَيْرًا أَوْ نَمَى خَيْرًا  

I did not hear the Messenger of Allah ﷺ making a concession for anything people say falsely except in three matters. The Messenger of Allah ﷺ would say: I do not count as a liar a man who puts things right between people, saying a word by which he intends only putting things right, and a man who says something in war, and a man who says something to his wife, or a wife who says something to her husband.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يُرَخِّصُ فِي شَىْءٍ مِنَ الْكَذِبِ إِلاَّ فِي ثَلاَثٍ كَانَ رَسُولُ اللَّهِ ﷺ يَقُولُ لاَ أَعُدُّهُ كَاذِبًا الرَّجُلُ يُصْلِحُ بَيْنَ النَّاسِ يَقُولُ الْقَوْلَ وَلاَ يُرِيدُ بِهِ إِلاَّ الإِصْلاَحَ وَالرَّجُلُ يَقُولُ فِي الْحَرْبِ وَالرَّجُلُ يُحَدِّثُ امْرَأَتَهُ وَالْمَرْأَةُ تُحَدِّثُ زَوْجَهَا