Saying of Blessed one in Anguttara Nikaya ?

Dear Learned ones,

I listened to a dhamma talk recorded on mp3 and wrote it down myself there might be mistakes i
asked for forgiveness.

I wish to find out where in the Anguttara Nikaya can a certain saying of the blessed one be found.
The Buddha said if a person says what is, are dhamma, what is contrary to the dhamma, then he
creat much de-merit for himself and harm a lots of humans and devas and he causes the
disappearance of the true dhamma.

On the other hand if a person said what is, are dhamma, and dare to criticize what is not dhamma,
then he create much merit for himself and he benefit lot of humans and devas and he preserve the
true dhamma . Can anyone point the chapter/verse to me?

metta,
Alex