Al-Kāfi

Hadith 1158
good-temper
3ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ إِسْمَاعِيلَ بْنِ مِهْرَانَ عَنْ سَيْفِ بْنِ عَمِيرَةَ عَمَّنْ ذَكَرَهُ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ إِنَّ سُوءَ الْخُلُقِ لَيُفْسِدُ الإيمَانَ كَمَا يُفْسِدُ الْخَلُّ الْعَسَلَ.
3. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from Isma’il ibn Mehran from Sayf ibn ‘Amirah from those whom he has mentioned (in his book) from Abu ‘Abdillah (a.s.) who has said the following: “Abu ‘Abd Allah (a.s.) has said, ‘Wicked and evil behavior spoils good deeds just as vinegar spoils honey.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī