Shiva Purana
तयोः पुत्रसहस्राणि षष्टिर्दानवनन्दनाः ॥ मरीचिर्जनयामास महता तपसान्वितः ॥ ३१॥
Kaśyapa, son of Marīci, endowed with great penance, begot of them sixty thousand sons delighting the Dānavas.
english translation
tayoH putrasahasrANi SaSTirdAnavanandanAH ॥ marIcirjanayAmAsa mahatA tapasAnvitaH ॥ 31॥
hk transliteration by Sanscript