Manasara 12.72

12.72

brahmagarbhaṃ kṣipetkāle tasya cihnaṃ ca yojayet
oṅkaraṃ nirmitam hemaṃ madhyakoṣṭhe tu vinyaset

one should cast the Brahmā deposit at the proper time and assign its emblem. / One should place a fashioned golden syllable Om in the central hall;