Vaisesika Sūtras
Vaisesika Sūtra 2.1.30
शब्दलिङ्गा विशेषाद्विशेषलिङ्गाभावाच्च ॥३०॥
The sound is the special distinguishing mark (of the space), because of the absence of other special distinguishing marks.

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ॐ असतो मा सद्गमय। तमसो मा ज्योतिर्गमय। मृत्योर्माऽमृतं गमय। ॐ शान्ति: शान्ति: शान्ति: ॥ - बृहदारण्यकोपनिषद् 1.3.28
"Ōm! Lead me from the unreal to the real, from darkness to light, and from death to immortality. Let there be peace, peace, and peace. Ōm!" - Brihadaranyaka Upanishad 1.3.28

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