Shiva Purana
क्रतोः क्रतुसमान्भार्या सन्नतिस्सुषुवे सुतान् ॥ नैषां भार्याश्च पुत्राश्च सर्वे ते ह्यूर्ध्वरेतसः ॥ २८ ॥
Sannati, wife of Kratu, bore him sons who were equal to Kratu. They did not marry and hence were issueless.
english translation
kratoH kratusamAnbhAryA sannatissuSuve sutAn ॥ naiSAM bhAryAzca putrAzca sarve te hyUrdhvaretasaH ॥ 28 ॥
hk transliteration by Sanscript