As the mistake was accomplished via the god Indra, he grants Hanuman a wish that his entire body might be as strong as Indra's Vajra, and that his Vajra also can not damage him. In conjunction with Indra other gods have also granted him needs: the God Agni granted Hanuman https://englandd319hou5.humor-blog.com/35759981/the-fact-about-hanuman-that-no-one-is-suggesting