Shiva Purana
ममार्थेन शिवेनेदं तामसेनाभिधीयते ॥ अथर्वाह तुरायाख्यं तुरीयातीतमेव च ॥ ३७ ॥
For My sake, this auspicious world is called Tamasena. The Atharva Veda is called Turaya and the fourth is past.
english translation
mamArthena zivenedaM tAmasenAbhidhIyate ॥ atharvAha turAyAkhyaM turIyAtItameva ca ॥ 37 ॥
hk transliteration by Sanscript