Garudapurana 1.11.22

1.11.22

saṅkarṣaṇādibījāni pūrvādikramayogataḥ /
dvāri pūrve pare caiva vainateyaṃ tu vinyaset //

the seed-syllables of Saṅkarṣaṇa and the others in the sequence beginning with the east. / At the eastern gate and at the western one, one should place Vainateya;