Srimad Bhagavatam Canto 07, Chapter 14, Text 19

SB 7.14.19

kuryad apara-paksiyam
 masi praustha-pade dvijah
sraddham pitror yatha-vittam
 tad-bandhunam ca vittavan
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
A brahmana who is sufficiently rich must offer oblations to the forefathers during the dark-moon fortnight in the latter part of the month of Bhadra. Similarly, he should offer oblations to the relatives of the forefathers during the mahalaya ceremonies in the month of Asvina.*
Srimad Bhagavatam Canto 07, Chapter 14, Text 18
Srimad Bhagavatam Canto 07, Chapter 14, Text 20-23