The Buddha shares the importance of explaining correctly what is not the Dhamma, discipline, spoken or uttered, practiced, and prescribed by the Tathāgata.
Adhamma vagga - The Chapter On Not The Teaching
1.140
"Bhikkhus, those bhikkhus who explain what is not the Dhamma as not the Dhamma are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
First.
1.141
"Bhikkhus, those bhikkhus who explain what is the Dhamma as the Dhamma are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Second.
1.142
"Bhikkhus, those bhikkhus who explain what is not the discipline as not the discipline are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Third.
1.143
"Bhikkhus, those bhikkhus who explain what is the discipline as the discipline are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Fourth.
1.144
"Bhikkhus, those bhikkhus who explain what was not spoken or uttered by the Tathāgata as not spoken or uttered by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Fifth.
1.145
"Bhikkhus, those bhikkhus who explain what was spoken or uttered by the Tathāgata as spoken or uttered by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Sixth.
1.146
"Bhikkhus, those bhikkhus who explain what was not practiced by the Tathāgata as not practiced by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Seventh.
1.147
"Bhikkhus, those bhikkhus who explain what was practiced by the Tathāgata as practiced by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Eighth.
1.148
"Bhikkhus, those bhikkhus who explain what was not prescribed by the Tathāgata as not prescribed by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Ninth.
1.149
"Bhikkhus, those bhikkhus who explain what was prescribed by the Tathāgata as prescribed by the Tathāgata are acting for the welfare of many people, for the happiness of many people, for the benefit, welfare, and happiness of many people, of gods and human beings. These bhikkhus generate much merit and help to establish the true Dhamma."
Tenth.