A liar is not one who tries to bring reconciliation amongst people and speaks good (in order to avert dispute), or he conveys good. Ibn Shihab said he did not hear that exemption was granted in anything what the people speak as lie but in three cases: in battle, for bringing reconciliation amongst persons and the narration of the words of the husband to his wife, and the narration of the words of a wife to her husband (in a twisted form in order to bring reconciliation between them).

بَايَعْنَ النَّبِيَّ ﷺ أَخْبَرَتْهُ أَنَّهَا سَمِعَتْ رَسُولَ اللَّهِ ﷺ وَهُوَ يَقُولُ لَيْسَ الْكَذَّابُ الَّذِي يُصْلِحُ بَيْنَ النَّاسِ وَيَقُولُ خَيْرًا وَيَنْمِي خَيْرًا قَالَ ابْنُ شِهَابٍ وَلَمْ أَسْمَعْ يُرَخَّصُ فِي شَىْءٍ مِمَّا يَقُولُ النَّاسُ كَذِبٌ إِلاَّ فِي ثَلاَثٍ الْحَرْبُ وَالإِصْلاَحُ بَيْنَ النَّاسِ وَحَدِيثُ الرَّجُلِ امْرَأَتَهُ وَحَدِيثُ الْمَرْأَةِ زَوْجَهَا

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