هَمَّازٍ
A Hammaz,
Ibn `Abbas and Qatadah both said, "This is slander."
مَّشَّاء بِنَمِيمٍ
going about with Namim,
This refers to the one who goes around among people instigating discord between them and carrying tales in order to corrupt relations between people when they are good and pleasant.
It is confirmed in the Two Sahihs that Mujahid reported from Tawus that Ibn `Abbas said,
"The Messenger of Allah once passed by two graves and he said,
إِنَّهُمَا لَيُعَذَّبَانِ وَمَا يُعَذَّبَانِ فِي كَبِيرٍ أَمَّا أَحَدُهُمَا فَكَانَ لَا يَسْتَتِرُ مِنَ الْبَوْلِ وَأَمَّا الاْخَرُ فَكَانَ يَمْشِي بِالنَّمِيمَة
Verily, these two are being punished, and they are not being punished for something major. One of them was not careful about protecting himself from urine (when relieving himself). The other one used to spread Namimah."
This Hadith has been recorded by the Group in their books through routes of transmission that are all on the authority of Mujahid.
Imam Ahmad recorded that Hudhayfah said,
"I heard the Messenger of Allah saying,
لَاا يَدْخُلُ الْجَنَّةَ قَتَّات
The slanderer will not enter into Paradise."
This Hadith has been reported by the Group except for Ibn Majah.
Concerning Allah's statement,
مَنَّاعٍ لِّلْخَيْرِ مُعْتَدٍ أَثِيمٍ