Ramayana
सा तु वेदश्रुतिं श्रुत्वा दृष्ट्वा वै तपसो निधिम् । अभवत्पाण्डुदेहा सा सुव्यञ्जितशरीरजा ॥ 7-2-17 ॥
And she, hearing that recitation of the Veda and beholding that treasure-house of asceticism, became pale of body, with the marks of pregnancy plainly showing upon her.
english translation