SB 9.9.22
pariveksyamanam bhagavan
vilokyabhaksyam añjasa
rajanam asapat kruddho
rakso hy evam bhavisyasi
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
While examining the food given to him, Vasistha Muni, by his mystic power, could understand that it was unfit to eat, being the flesh of a human being. He was very angry at this and immediately cursed Saudasa to become a man-eater.