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SB 6.4.20
tam abrmhitam alokya
praja-sargam prajapatih
vindhya-padan upavrajya
so ’carad duskaram tapah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
But when Prajapati Daksa saw that he was not properly generating all kinds of living entities, he approached a mountain near the Vindhya mountain range, and there he executed very difficult austerities.