Sunan Abi Dawud 4907
سنن أبي داود#4907Sahihحَدَّثَنَا هَارُونُ بْنُ زَيْدِ بْنِ أَبِي الزَّرْقَاءِ، حَدَّثَنَا أَبِي، حَدَّثَنَا هِشَامُ بْنُ سَعْدٍ، عَنْ أَبِي حَازِمٍ، وَزَيْدِ بْنِ أَسْلَمَ، أَنَّ أُمَّ الدَّرْدَاءِ، قَالَتْ سَمِعْتُ أَبَا الدَّرْدَاءِ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " لاَ يَكُونُ اللَّعَّانُونَ شُفَعَاءَ وَلاَ شُهَدَاءَ " .
Abu 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
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih Muslim (2598)
In-book reference: 43:135