In an Indian astrological journal from 1963 (Astrology and Athrishta [= adṛṣṭa] 1.2), I read:

Have we not heard the usual proverb "Aye! that fellow has Saturn in the tongue? Vakkil-Sani. Ever he predicts evil and never he fails.)

Are any list members familiar with such a proverb/expression? I have not seen it referred to anywhere else, but then Tamil isn't one of my languages.

Best wishes,
Martin Gansten