SB 3.21.37
tasmin sudhanvann ahani
bhagavan yat samadisat
upayad asrama-padam
muneh santa-vratasya tat
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O Vidura, they reached the hermitage of the sage, who had just completed his vows of austerity on the very day foretold by the Lord.