Abu Darda (may Allah be pleased with him) narrates from the Prophet (peace and blessings of Allah be upon him), he (peace and blessings of Allah be upon him) said: "On the Day of Resurrection, nothing will be placed in the believer’s scale heavier than good character, and Allah certainly does not like the one who is foul-mouthed and engages in obscene talk." (Tirmidhi), and he said: This hadith is Hasan Sahih, and Abu Dawood has narrated the first part. Its chain is authentic, narrated by Tirmidhi and Abu Dawood.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 5081
Hadith Gradingالألبانی:لم تتمّ دراسته | زبیر علی زئی:إسناده صحيح
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده صحيح، رواه الترمذي (2002) و أبو داود (4799)»