Srimad Bhagavatam Canto 08, Chapter 16, Text 47

SB 8.16.47

evam tv ahar ahah kuryad
 dvadasaham payo-vratam
harer aradhanam homam
 arhanam dvija-tarpanam
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
In this way, until twelve days have passed, one should observe this payo-vrata, worshiping the Lord every day, executing the routine duties, performing sacrifices and feeding the brahmanas.
Srimad Bhagavatam Canto 08, Chapter 16, Text 46
Srimad Bhagavatam Canto 08, Chapter 16, Text 48