Valmiki Ramayana Ayodhya Kanda Sarga 12 Shloka 81

त्वया सार्धम् together with you, रममाणः while sporting, त्वाम् you, मृत्युम् as death, नाभिलक्षये did not mark, बालः like a child, रहसि in a solitary place, हस्तेन with hand, कृष्णसर्पमिव like a black cobra, अस्पृशम् touched.

While sporting with you, I did not realize you were death incarnate. Like a child handling a black cobra I caressed you.