Valmiki Ramayana Sundara Kanda Sarga 53 Shloka 7

लाङ्गूले while that tail, संवेष्ट्यमाने was being swathed, महाकपिः great vanara, वनेषु in the woods, शुष्कम् dried, इन्धनम् firewood,आसाद्य caught, हुताशनः इव like the fire, व्यवर्धत grew in size.

While the tail was being swathed, the great vanara grew in size like wild fire fed with dry firewood.