Shiva Purana
यामाहुस्तामसीं रौद्रीं मूर्तिमंतकरीं हरेः ॥ सृजत्यशेषमीशस्य शासनाच्चतुराननः ॥ ३२ ॥
The fierce form of the Supreme Personality of Godhead is called Tāmasi. The four-faced Lord creates the rest by the command of the Lord.
english translation
yAmAhustAmasIM raudrIM mUrtimaMtakarIM hareH ॥ sRjatyazeSamIzasya zAsanAccaturAnanaH ॥ 32 ॥
hk transliteration by Sanscript