Hadith
أَخْبَرَنَا بِشْرُ بْنُ خَالِدٍ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ عَنْ شُعْبَةَ عَنْ سُلَيْمَانَ عَنْ عَبْدِ اللَّهِ بْنِ مُرَّةَ عَنْ مَسْرُوقٍ عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ أَرْبَعَةٌ مَنْ كُنَّ فِيهِ كَانَ مُنَافِقًا أَوْ كَانَتْ فِيهِ خَصْلَةٌ مِنْ الْأَرْبَعِ كَانَتْ فِيهِ خَصْلَةٌ مِنْ النِّفَاقِ حَتَّى يَدَعَهَا إِذَا حَدَّثَ كَذَبَ وَإِذَا وَعَدَ أَخْلَفَ وَإِذَا عَاهَدَ غَدَرَ وَإِذَا خَاصَمَ فَجَرَ
It was narrated from 'Abdullah bin 'Amr that:The Prophet [SAW] said: "There are four (traits), whoever has them is a hypocrite and whoever has one of them, then has one of the traits of hypocrisy, until he gives it up: When he speaks, he lies; when he makes a promise, he breaks it; when he makes a covenant, he betrays it; and when he argues, he resorts to foul language
Sahih · Abu Ghuddah
Sunan an-Nasa'i 5020 ·Book 47, Hadith 36·Also available on sunnah.com·