"There was no behavior more hated to the Messenger of Allah than lying. A man would lie in narrating something in the presence of the Prophet, and he would not be content until he knew that he had repented." (Using translation from Tirmidhī 1973)
مَا كَانَ خُلُقٌ أَبْغَضَ إِلَى أَصْحَابِ رَسُولِ اللهِ ﷺ مِنَ الْكَذِبِ وَلَقَدْ كَانَ الرَّجُلُ يَكْذِبُ عِنْدَ رَسُولِ اللهِ ﷺ الْكَذِبَةَ فَمَا يَزَالُ فِي نَفْسِهِ عَلَيْهِ حَتَّى يَعْلَمَ أَنَّهُ قَدْ أَحْدَثَ مِنْهَا تَوْبَةً