svara as breathing/respiration

[Nivedita Rout]

Respected Scholars,

I am looking for the earliest textual references of "svara" used in term of "breathing" apart from Yogic texts. 
I find close evidences i.e  "praa.na is svara" in Upanisads.Still I look for it in particular in tantra literature. 

Thank you all in advance for your help and suggestions!
Regards,


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