This was said by the Blessed One, said by the Arahant, as I have heard:

"Bhikkhus, abandon one thing; I am your guarantor for non-returning. What one thing? Bhikkhus, abandon anger; I am your guarantor for non-returning."

The Blessed One spoke on this matter. In this regard, it is said:

"When overcome by anger, beings go to a bad destination; Completely comprehending anger, those with insight abandon it; Having abandoned it, they do not come again, to this world at any time."

This matter too was spoken by the Blessed One, as I have heard.