Shiva Purana
धात्रा सृष्टश्शतमखो दैत्यो वर्षशतं पुरा ॥ तपः कृत्वा सहस्रं तु पुत्राणामलभद्भवात् ॥ १३ ॥
The Daitya Śatamukha created by Brahmā, performed the penance of Śiva formerly for a hundred years and obtained a thousand sons.
english translation
dhAtrA sRSTazzatamakho daityo varSazataM purA ॥ tapaH kRtvA sahasraM tu putrANAmalabhadbhavAt ॥ 13 ॥
hk transliteration by Sanscript