Valmiki Ramayana Sundara Kanda Sarga 53 Shloka 34
Original Shlokaदह्यमाने च लाङ्गूले चिन्तयामास वानरः।।5.53.34।। प्रदीप्तोऽग्निरयं कस्मान्न मां दहति सर्वतः।
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लाङ्गूले when the tail, दह्यमाने when it was ablaze, वानरः vanara, चिन्तयामास thought, सर्वतः on every side, प्रदीप्तः kindled अयम् this अग्निः fire, माम् me, कस्मात् why not me, न दहति is not burning.
When the tail was burning, the vanara wondered how the fire ablaze on every side was not burning him: