yo hy adharmeṇa vibrūyād gṛhṇīyād vāpy adharmataḥ
yo hy adharmeṇa vibrūyād gṛhṇīyād vāpy adharmataḥ |
hīyetāṁ tāv ubhau kṣipraṁ syātāṁ vā vairiṇāv ubhau ||
(Mahābhārata: 9.50.46)
“One who shall teach undharmicly [i.e., without accepting the student as a disciple] and one who shall acquire [knowledge] undharmicly [i.e., without acceptance of discipleship to the teacher]—both shall quickly abandon one another or become enemies of one another.”