Shiva Purana

siva.sh/siva-purana/uma-samhita/2/49

सावर्णिरिति विख्यात ऋषिरासीत्कृते युगे ।। इह तेन तपस्तप्तं षष्टिवर्षशतानि च ।। ४९ ।।

sanskrit

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