Shiva Purana
महादेवप्रसादस्य भाग्यापन्नस्य भाविनः ॥ दुग्धाभिलाषप्रभवद्वारतामगमत्तपः ॥ ६ ॥
His penance for the sake of obtaining milk became the gateway to the future grace of lord Śiva obtained due to good luck.
english translation
mahAdevaprasAdasya bhAgyApannasya bhAvinaH ॥ dugdhAbhilASaprabhavadvAratAmagamattapaH ॥ 6 ॥
hk transliteration by Sanscript