Shiva Purana
चतुस्साहस्रसंख्याकमेवं संख्याविभेदतः ॥ श्रुतम्परमपुण्यन्तु पुराणं शिवसंज्ञकम् ॥ ६४ ॥
Thus the number of the four thousand is different. I have heard the most pious Purana called Shiva.
english translation
catussAhasrasaMkhyAkamevaM saMkhyAvibhedataH ॥ zrutamparamapuNyantu purANaM zivasaMjJakam ॥ 64 ॥
hk transliteration by Sanscript