Shiva Purana
तस्यैवं जनयेत्क्षात्रमुद्धारं च ततः पुनः ॥ कृत्वा तथैव विप्रत्वं जनयेदस्य देशिकः ॥ ४६ ॥
In this way one should beget a kṣatriya and then rescue him again and again. After doing so the śāstra should make him a brāhmaṇa.
english translation
tasyaivaM janayetkSAtramuddhAraM ca tataH punaH ॥ kRtvA tathaiva vipratvaM janayedasya dezikaH ॥ 46 ॥
hk transliteration by Sanscript