Shiva Purana
सावर्णिरिति विख्यात ऋषिरासीत्कृते युगे ॥ इह तेन तपस्तप्तं षष्टिवर्षशतानि च ॥ ४९ ॥
In the Kṛta Yuga there was a sage famous as Sāvarṇi. He performed penance for six thousand years.
english translation
sAvarNiriti vikhyAta RSirAsItkRte yuge ॥ iha tena tapastaptaM SaSTivarSazatAni ca ॥ 49 ॥
hk transliteration by Sanscript