As the mistake was performed by the god Indra, he grants Hanuman a want that his overall body would be as sturdy as Indra's Vajra, Which his Vajra can also not harm him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://yantra49371.pages10.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-hanuman-72229270