Tatiyaabhabbaṭṭhāna Sutta #
“Monks, six things are impossible.
What are they?
It is impossible for one who sees [the Dhamma]:
(1) To deprive their mother of life;
(2) To deprive their father of life;
(3) To deprive a Perfected being of their life;
(4) To shed the Truth-Finder’s blood with corrupted ambitions,
(5) To bring about a schism in the community;
(6) To change for another teacher. 
These six things are impossible monks.
 aññaṁ satthāraṁ uddisituṁ.