Shiva Purana
एतस्मिन्नंतरे व्योम्नः श्रुताः वागरीरिणी ॥ सत्यमोममृतं सौम्यमित्याविरभवत्स्फुटम् ॥ ९५ ॥
In the meantime an unembodied voice was heard from the sky. “Satyam (Truth), Amṛtam (nectar), Saumyam” (gentle), Om Amen. This sound came out clearly.
english translation
etasminnaMtare vyomnaH zrutAH vAgarIriNI ॥ satyamomamRtaM saumyamityAvirabhavatsphuTam ॥ 95 ॥
hk transliteration by Sanscript