Mbh 13.40.6b

The very Creator of the universe is not equal to that feat. He makes himself invisible when he chooses. He is incapable of being seen except with the eye of knowledge. The chief of the celestials sometimes transforms himself into the wind. The chastiser of Paka always assumes these disguises. Do thou, therefore, O Vipula, protect this slender-waisted spouse of mine with great care. O foremost one of Bhrigu's race, do thou take every care for seeing that the chief of the celestials may not defile this spouse of mine like a wretched dog licking the Havi kept in view of a sacrifice.' Having said these words, the highly-blessed Muni, viz., Devasarman, intent upon performing a sacrifice, set out from his abode, O chief of the Bharatas. Hearing these words of his preceptor, Vipula began to think, 'I shall certainly protect this lady in every respect from the puissant chief of the celestials. But what should be the means? What can I do in this matter of protecting the wife of my preceptor? The chief of the celestials is endued with large powers of illusion. Possessed of great energy, he is difficult of being resisted. Indra cannot be kept out by enclosing this retreat of ours or fencing this yard, since he is capable of assuming innumerable forms. Assuming the form of the wind, the chief of the celestials may assault the spouse of my preceptor. The best course, therefore, for me, would be to enter (by Yoga-power) the body of this lady and remain there. By putting forth my prowess I shall not be able to protect the lady, for the puissant chastiser of Paka, it has been heard by me, is capable of assuming any form he likes. I shall, therefore, protect this one from Indra by my Yoga-power. For carrying out my object I shall with my body enter the body of this lady. If my preceptor, coming back, beholds his spouse defiled, he will, without doubt, curse me through wrath, for endued with great ascetic merit, he is possessed of spiritual vision.