Valmiki Ramayana Kishkindha Kanda Sarga 13 Shloka 23

त्रेताग्नयोऽपि three sacred fires (Dakshinagni, Ahavaniya, Garhapatya fires), दीप्यन्ते shining, वृक्षाग्रान् treetops, वेष्टयन्निव as if enveloping, कपोताङ्गारुणः red like the pigeon's feet, घनः thick,दूमो smoke, एषः this, प्रकाशते हि glows.

'The three sacred fires keep burning and the thick smoke they emit resembles the red feet of pigeons. It shines forth as if enveloping the treetops.