The Sraddha Ritual : Purificatory Rites - Verse 36-40

Whatever is witnessed by these, goes over to Asuras and Yatudhanas. Krtayuga is said to be the age of Brahmanas. Tretayuga is remembered as the age of Ksatriyas. They say that Dvaparayuga is the age of Vaisyas and Kaliyuga is remembered as the age of Sudras. Pitjrs said : The Vedas are to be worshipped in Krtayuga. Similarly Suras are to be worshipped in Tretayuga. Wars are always to be worshipped in Dvapara and the heretics in Kaliyuga. There is no doubt in this that these spoil a Sraddha by their mere sight : the dishonoured, the unholy, fowl, domestic pig and dog. The Sraddha materials touched by calves and the people having pollution and chronic ailments are defiled. Cooked food should never be seen by dirty or fallen persons. If they see, it cannot be used as Havya and Kavya ( offerings to gods and Pitjrs) .