Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
tabarani:19642ʿAlī b. al-Mubārak al-Ṣanʿānī > Yazīd b. al-Mubārak > Muḥammad b. Thawr > Ibn Jurayj

[Machine] Mujahid said about the statement "Evil speech is for evil people, and good speech is for good people": "Bad speech is for the righteous believer and bad speech is for the disbeliever."  

الطبراني:١٩٦٤٢حَدَّثَنَا عَلِيُّ بْنُ الْمُبَارَكِ الصَّنْعَانِيُّ ثنا يَزِيدُ بْنُ الْمُبَارَكِ ثنا مُحَمَّدُ بْنُ ثَوْرٍ عَنِ ابْنِ جُرَيْجٍ

عَنْ مُجَاهِدٍ فِي قَوْلِهِ {الْخَبِيثَاتُ لِلْخَبِيثِينَ وَالطَّيِّبَاتُ لِلطَّيِّبِينَ} قَالَ «الْقَوْلُ السُّوءُ وَالْقَوْلُ الْحَسَنُ لِلْمُؤْمِنِ الْحَسَنِ وَلِلْكَافِرِ السَّيِّءِ»