Shiva Purana
सगरस्स्वां प्रतिज्ञां तु गुरोर्वाक्यं निशम्य च॥ धर्मं जघान तेषां वै केशान्यत्वं चकार ह ॥ ४४ ॥
At the instance of his priest Sagara maintained his vow by destroying their mode of worship and effecting alterations in their hair style.
english translation
sagarassvAM pratijJAM tu gurorvAkyaM nizamya ca॥ dharmaM jaghAna teSAM vai kezAnyatvaM cakAra ha ॥ 44 ॥
hk transliteration by Sanscript