Shiva Purana
संसिक्तायां तनौ भूयश्शुद्धदेहस्सुभावनः ॥ सोहमित्यवतीर्याथ स्वात्मानं हृदयाम्बुजे ॥ ५७ ॥
When the body was soaked he became more pure and pleasant Then he descended to the lotus of his heart saying 'Soham'.
english translation
saMsiktAyAM tanau bhUyazzuddhadehassubhAvanaH ॥ sohamityavatIryAtha svAtmAnaM hRdayAmbuje ॥ 57 ॥
hk transliteration by Sanscript