Manava Dharmashastra 4.255

4.255

anyathābhūtamadhārmikaṃ santaṃ satsu śiṣṭeṣvanyathā bhāṣate dhārmiko'hamiti | anyena vā prayojanena cāśrito'nyad darśayati sa sarveṣāṃ pāpakṛtāmadhikatamaḥ pāpakṛt |
stenaścauraḥ |
ātmāpahārako'nyaścauro dravyamapaharatyayaṃ punarātmānameveti nindātiśayaḥ |

Medhātithi’s commentary (manubhāṣya):
Being of one kind,;—i.e., unrighteous—if he describes himself to ‘good men’—to cultured people—‘otherwise’—describing himself as righteous;—or, when he goes to a man for one purpose, and represents it to be something else,—such a person is the worst of all sinners.

‘Thief’— stealer;—‘stealing himself.’ Other thieves steal things, while this person steals himself. This shows the despicable character of the man.—(255)