Sunan Abi Dawud 4907
سنن أبي داود#4907SahihAbu al-Darda’ said :I heard the Messenger of Allah (May peace be upon him) say: Men given to cursing will not be witnesses or intercessors
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Muslim (2598)
In-book reference: 43:135