Shiva Purana
संक्षिप्यास्य प्रवक्तारश्चत्वारः परमर्षय ॥ रुरुर्दधीचो ऽगस्त्यश्च उपमन्युर्महायशाः ॥ १५ ॥
The four great sages Ruru, Dadhīca, Agastya and the renowned Upamanyu have condensed these principles and propagated them.
english translation
saMkSipyAsya pravaktArazcatvAraH paramarSaya ॥ rururdadhIco 'gastyazca upamanyurmahAyazAH ॥ 15 ॥
hk transliteration by Sanscript