Skandapurana 5.222

Bhartṛyajña said: / The śrāddha on the new moon, the pārvaṇa, must be performed with brahmins who are worthy of śrāddha. / Under no circumstances should a contrary, single śrāddha be performed.

The man who performs a śrāddha through brahmins / who are born of adultery, abandoned, and the like—without doubt, that śrāddha becomes useless.

Ānarta said: / A very great fear has arisen in me regarding what was stated here: / that a śrāddha performed through those born of adultery or abandoned becomes useless.

Twelve sons were indeed declared by Manu, O great-minded one, / who always serve as sons for those without sons:

the son of the body, the son of the wife, the bought son, and the foster son, / the accepted son, the son taken with the pregnant bride, and the son of an unmarried girl, O best of men;

likewise the other two, the kuṇḍa and the golaka, are also proclaimed as sons;

the pupil, the one saved from death, and likewise the aśvattha tree grown in the forest. / Were these not mentioned [by him], that you speak in such a manner?

Bhartṛyajña said: / This is true, O highly fortunate one: they are all sons according to righteousness, / but they were declared for the three [earlier] ages, not as destroyers of sins in the Kali age.

For that reason, lineage through them was limited to that extent in each age / for men rich in fortitude, and not in the Kali age for those of little intellect.

In the Kali age alone, conduct was declared to be a source of downfall. / Because people are of weak fortitude, this rule was remembered [for them].

Hear the fruit of him who causes confusion of birth here: / from a brahmin woman by a brahmin, a son who is a killer of brahmins is born;

he is the lowest of all low men, who is known as a vāraḍa;

by a kṣatriya, a sūta; from a vaiśya, a māgadha; / and from a śūdra, an outcaste is declared; therefore these sons are avoided.

Even among these, O king, seven are indicated as good sons; / five lead to the destruction of the lineage and to the downfall of ancestors.

The son of the body, the accepted son, the bought, and the foster son, / the pupil, the one whose life was saved, and the aśvattha tree as the seventh:

these indeed always protect a man falling into the terrible hell / named Put; therefore they are remembered as auspicious.

The son of the wife, the son taken with the pregnant bride, the son of an unmarried girl, and the kuṇḍa and golaka— / these five cause even ancestors gone to heaven to fall.

For this reason, the śrāddha of one born of an adulterous union is in vain.

Thus ends the two hundred and twenty-third chapter, titled "Description of Brahmins Worthy and Unworthy of Śrāddha and Others, in the Ritual of Śrāddha," in the Māhātmya of the Sacred Field of Hāṭakeśvara, in the Nāgarakhaṇḍa, the sixth [part] of the auspicious Skanda Mahāpurāṇa consisting of eighty-one thousand verses.