Srimad Bhagavatam Canto 09, Chapter 02, Text 01

SB 9.2.1

sri-suka uvaca
evam gate ’tha sudyumne
 manur vaivasvatah sute
putra-kamas tapas tepe
 yamunayam satam samah
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
Sukadeva Gosvami said: Thereafter, when his son Sudyumna had thus gone to the forest to accept the order of vanaprastha, Vaivasvata Manu [Sraddhadeva], being desirous of getting more sons, performed severe austerities on the bank of the Yamuna for one hundred years.
Srimad Bhagavatam Canto 09, Chapter 02, Text 02