As the mistake was carried out from the god Indra, he grants Hanuman a wish that his physique could be as sturdy as Indra's Vajra, and that his Vajra could also not harm him. In conjunction with Indra other gods have also granted him wishes: the God Agni granted Hanuman https://claytonwfkhc.izrablog.com/37489032/hanuman-for-dummies