As the mistake was accomplished because of the god Indra, he grants Hanuman a wish that his body can be as sturdy as Indra's Vajra, Which his Vajra can also not hurt him. Together with Indra other gods have also granted him wishes: the God Agni granted Hanuman a want https://shanidevtemplenearme.blogspot.com/2025/03/explore-cultural-and-religious-heritage.html