Arabic text
عَنْ عَبْدِ اللهِ بْنِ مَسْعُودٍ رضي الله عنه قَالَ: قَالَ رَسُولُ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «لَيْسَ الْمُؤْمِنُ بِالطَّعَّانِ وَلاَ اللَّعَّانِ وَلاَ الفَاحِشِ وَلاَ البَذِيءِ».
Translation
‘Abdullāh ibn Mas‘ūd (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "A believer is not a slanderer, nor a curser, nor a person who speaks obscenely, nor a person who uses foul language."
Explanation
The Prophet (may Allah's peace and blessings be upon him) informed us that it is not the nature of a believer who has complete Imān to criticize people’s lineage, or to revile and curse others, or to be obscene in action or speech without shame.
Source: HadeethEnc.com