"Mañjusri, the karmic obstruction of abandoning the excellent teaching is subtle. Mañjusri, whoever distinguishes some of the words spoken by the Tathāgata as good and some as bad abandons the teaching. One who abandons the teaching, by having abandoned it, deprecates the Tathāgata and speaks badly of the community. If you say, "This is reasonable; this is unreasonable," you abandon the teaching. If you say, "This was set forth for the sake of bodhisattvas; this was set forth for the sake of srāvakas," you abandon the teaching. If you say, "This was set forth for the sake of pratyekabuddhas," you abandon the teaching. If you say, "This is not a training of bodhisattvas," you abandon the teaching."

Sarva-vaidalya-samgraha-sutra