Matsyapurana 61.46

61.46

aṅguṣṭhamātraṃ puruṣaṃ tathaiva sauvarṇam atyāyatabāhudaṇḍam
caturmukhaṃ kumbhamukhe nidhāya dhānyāni saptāmbarasaṃyutāni //

Afterwards, a golden image, of the size of a thumb, with extensive arms and four heads, should be made and placed on top of the pitcher; and then, after filling it in with sapta-dhânya and decorating with cloth.—46.