Shiva Purana
वायुरुवाच ॥ कालकाष्ठानिमेषादिकलाकलितविग्रहम् ॥ कालात्मेति समाख्यातं तेजो माहेश्वरं परम् ॥ ६ ॥
Vāyu said:— It is the great splendour of lord Śiva named Kālātman. Kalā, Kāṣṭḥā, Nimeṣa are the forms it embodies.
english translation
vAyuruvAca ॥ kAlakASThAnimeSAdikalAkalitavigraham ॥ kAlAtmeti samAkhyAtaM tejo mAhezvaraM param ॥ 6 ॥
hk transliteration by Sanscript