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.