As the mistake was completed from the god Indra, he grants Hanuman a wish that his entire body could be as strong as Indra's Vajra, Which his Vajra also can not damage him. Along with Indra other gods have also granted him wishes: the God Agni granted Hanuman a desire https://hanumantempleadelaide.politics.blog/2024/11/16/exploring-devotional-landmarks-sacred-spaces-in-adelaide-and-beyond/