BṚHADĀRAṆYAKA UPANISHAD · 3.2.5

चक्षुर् वै ग्रहः ।
स रूपेणातिग्रहेण गृहीतः ।
चक्षुषा हि रूपाणि पश्यति ॥

cakṣur vai grahaḥ ।
sa rūpeṇātigraheṇa gṛhītaḥ ।
cakṣuṣā hi rūpāṇi paśyati ॥

'The eye is one Graha, and that is seized by form as the Atigrâha, for with the eye one sees forms.'

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)