As the mistake was completed because of the god Indra, he grants Hanuman a wish that his entire body could be as potent as Indra's Vajra, and that his Vajra also can not hurt him. As well as Indra other gods have also granted him wishes: the God Agni granted https://fab-directory.com/listings13360001/the-single-best-strategy-to-use-for-hanuman