Valmiki Ramayana Ayodhya Kanda Sarga 64 Shloka 15
Original Shlokaततश्श्रुतो मया शब्दो जले कुम्भस्य पूर्यतः। द्विपोऽयमिति मत्वाऽयं बाणेनाभिहतो मया।।2.64.15।।
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ततः thereafter, मया by me, जले in the water, पूर्यतः being filled, कुम्भस्य pot's, शब्दः sound, श्रुतः was heard, अयम् this one, द्विपः इति taking for an elephant, मत्वा having thought, अयम् he, मया by me, बाणेन with arrow, अभिहतः was killed.
There I heard the sound of a pot being filled with water and mistaking it to be an elephant's, shot an arrow.