[INDOLOGY] Source of quote about OM and atha

[Harry Spier]

Can someone give me the source for the  following quote in Apte's
dictionary about OM and atha.
ओंकारश्चाथ शब्दश्च द्वावेतौ ब्रह्मणः पुरा । कंठं भित्त्वा विनिर्यातौ
तेन मांगलिकावुभौ
॥

Thanks,
Harry Spier


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