Valmiki Ramayana Aranya Kanda Sarga 50 Shloka 16

आशीविषम् venomous, सर्पम् serpent, वस्रान्ते with the skirt of your cloth, बद्ध्वा binding, नावबुध्यसे not understand, ग्रीवायाम् to the neck, प्रतिसक्तम् fastened tightly, कालपाशम् noose of death, न पश्यसि do not see.

You are not aware that you are tying a venomous snake with the skirt of your cloth. worn by you. You are not able to see the noose of death tightened around your neck.