Skandapurana 5.217.6

5.217.6

jātā ye gotrajāḥ kecidaputrā maraṇaṃ gatāḥ ..
te yāṃti paramāṃ tṛptimamṛtena yathā surāḥ .. ..
viprapādodakaklinnā yāvattiṣṭhati medinī..
tāvatpuṣkarapātreṣu pibanti pitaro jalam..6..

those born of the family who have died sonless, / they attain supreme satisfaction, as gods do with ambrosia. / As long as the earth remains wet with the water from washing the brahmin's feet, / so long do the ancestors drink water from lotus-leaf cups. 6