As the error was accomplished because of the god Indra, he grants Hanuman a want that his human body might be as powerful as Indra's Vajra, Which his Vajra may not hurt him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a wish https://panchmukhihanumantemplenearme.blogspot.com/2025/01/hanuman-mandirs-centers-of-devotion-and.html