Explanation:

Third Buddhist Council was convened by the Mauryan king Ashoka at Pataliputra , under the leadership of the monk Moggaliputta Tissa. Its objective was to purify the Buddhist movement, particularly from opportunistic factions which had been attracted by the royal patronage. The king asked the suspect monks what the Buddha taught, and they claimed he taught views such as eternalism, etc., which are condemned in the canonical Brahmajala Sutta. He asked the virtuous monks, and they replied that the Buddha was a "Teacher of Analysis" (Vibhajjavadin), an answer that was confirmed by Moggaliputta Tissa. The Council proceeded to recite the scriptures once more, adding to the canon Moggaliputta Tissa's own book, the Kathavatthu, a discussion of various dissenting Buddhist views now contained in the Theravada Abhidhamma Pitaka. This council seems to have been the cause of the split between the Sarvastivada and the Vibhajjavada schools.