Transliteration:( Fa aqbala ba'duhum 'alaa ba'diny yatalaawamoon )
28. From then it was criticizing one another that you gave one bad advice. Eventually they said we are all guilty.
The tafsir of Surah Qalam verse 30 by Ibn Kathir is unavailable here.
Please refer to Surah Qalam ayat 29 which provides the complete commentary from verse 29 through 30.
(68:30) Then they began to reproach one another.[18]
18. That is, each reproached and blamed the other that because of his wrong counsel they had forgotten God and resolved upon an evil course. 3
Related Ayat(Verses)/Topics