Ibn Kathir dedicated immense effort to verifying the authenticity of the Hadiths he used, often discussing the reliability of various narrators.
It is a prime example of tafsir bil-ma'thur , which uses traditional sources like Hadith and reports from the early generations of Islam ( Salaf ).
This site provides an online version of Tafsir Ibn Kathir in Tamil , allowing users to read the commentary directly on their browsers.