B.G 9.30 to 33
Even if one is extremely ill-behaved, if he worships Me with exclusive devotion, he is to be considered saintly, for he is rightly resolved.
He quickly becomes righteous and attains eternal peace; O son of Kunti, understand conclusively that My devotee never perishes.
Even those of sinful birth - women, merchants, and labourers, if they take refuge in Me, O Arjuna, they too attain the supreme destination.
What to speak then of virtuous Brahmins and royal sages who are devoted? Having attained this impermanent and joyless world, worship Me.
Gīta Bhāshya 9.30 to 33
The Lord devotees generally does not misbehave. But because of unwinding of karma, temporarily he may misbehave. Such exceptions are rare and not common.
Generally, a devotee does not become extremely ill-behaved; yet, because of excessive merit, somehow, he does, even then he is to be considered saintly.
How does such a one quickly become righteous? It happens only for those deities, sages and those who have portions of the deities or sages. This is also stated in the Śāṇḍilya branch of the Vedas.
"One who has not turned away from evil conduct, who is not devoted, and who is not composed - none of them can truly become a proper devotee of Vāsudeva with a pure heart. Divine sages and those who are their portions become through their knowledge."
- stated thus.
Therefore, if some other person appears (to be a devotee), he is to be inferred as hypocritical. Even among great sinners, devotion may arise rarely from their association (with great devotees). Elsewhere, there is usually only ordinary devotion:
"He who, with a deceitful mind, pursues craving for wealth - know him to be of vile conduct; he has no true devotion."
- stated thus in the Śrī Viṣṇu Purāṇa.
