Ramayana
तस्य रूपं शरस्यासीत्विधूमज्वालमण्डलम् । वनं दहिष्यतो घर्मे दावाग्नेरिव मूर्च्छतः ॥ 7-21-43 ॥
The form of that arrow was a smokeless circle of flame, like a forest-fire blazing up in the summer heat as it sets about to consume a wood.
english translation