mama śāstraṁ bahiṣkṛtya asmākaṁ yaḥ prapadyate
mama śāstraṁ bahiṣkṛtya asmākaṁ yaḥ prapadyate |
muktvā ca mama śāstrāṇi śāstram anyat prabhāṣase ||
(Varāha Purāṇa; cited in Hari-bhakti-vilāsa: 8.460)
“One who excludes śāstra related to me and takes shelter in me [alt., approaches me, that is, performs upāsanā (worship)], and one who rejects śāstras related to me and teaches other śāstra … [commits offense to me].”