Vedic scriptural reference of third eye🔗

Let form be filled with essence of life-breath to the crown of head. Cross the life-breath by penetrating with one-pointed attention at the bridge_x0002_like center of the eyebrows (called the third eye). Let mind be beyond the movement of thoughts [nirvikalpam manah]. In that all-rising supreme state of Sadashiva, showers the light (vision) of all pervadingness.

Shaastra Pramana: Vijñāna Bhairava Tantra, sutra 31, dhāraṇa 8