Shiva Purana
आकाशयोनिर्द्विगुणः स्पर्शशब्दसमन्वयात् ॥ तेजसां प्रकृतिश्चेति यमाहुस्तत्त्वचिंतकाः ॥ ७ ॥
The source of the sky is twice as great as the sound of touch. That which the thinkers of the truth call the nature of the effulgence.
english translation
AkAzayonirdviguNaH sparzazabdasamanvayAt ॥ tejasAM prakRtizceti yamAhustattvaciMtakAH ॥ 7 ॥
hk transliteration by Sanscript