Mahabharata 3.146.60

3.146.60

kadalīṣaṇḍamadhyastho nidrāvaśagatastadā |
jṛmbhamāṇaḥ suvipulaṃ śakradhvajamivocchritam |
āsphoṭayata lāṅgūlamindrāśanisamasvanam || 60 ||

And thinking that he (Bhima) should not pass that way,(Hanuman) lay across the narrow path, beautified by plantain trees, obstructing it for the sake of the safety of Bhima. With the object that Bhima might not come by curse or defeat, by entering into the plantain wood, the ape Hanuman of huge body lay down amidst the plantain trees, being overcome with drowsiness. And he began to yawn, lashing his long tail, raised like unto the pole consecrated to Indra, and sounding like thunder. And on all sides round, the mountains by the mouths of caves emitted those sounds in echo, like a cow lowing. And as it was being shaken by the reports produced by the lashing of the tail, the mountain with its summits tottering, began to crumble all around. And overcoming that roaring of mad elephants, the sounds of his tail spread over the varied slopes of the mountain.