As The error was completed from the god Indra, he grants Hanuman a want that his body can be as robust as Indra's Vajra, and that his Vajra may also not harm him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a desire https://presslivepulse.blogspot.com/2024/11/spirituality-at-hanuman-mandir-and.html