Once in his childhood, believing the Sun to be a ripe mango, Lord Hanuman pursued it in order to eat it. Rahu, a Vedic planet corresponding to an eclipse, was at that time seeking out the sun as well, and he clashed with Hanuman.

Once in his childhood, believing the Sun to be a ripe mango, Lord Hanuman pursued it in order to eat it. Rahu, a Vedic planet corresponding to an eclipse, was at that time seeking out the sun as well, and he clashed with Hanuman. Hanuman thrashed Rahu and went to take the sun in his mouth. Rahu approached Indra, king of devas, and complained that a monkey child stopped him from taking on Sun, preventing the scheduled eclipse. This enraged Indra, who responded by throwing the Vajra (thunderbolt) at Hanuman, which struck his jaw. He fell back down to the earth and became unconscious. A permanent mark was left on his chin ( hanu, "jaw" in Sanskrit), due to impact of Vajra, explaining his name. Upset over the attack, Hanuman's father figure Vayu deva (the deity of air) went into seclusion, withdrawing air along with him. As living beings began to asphyxiate, Indra withdrew the effect of his thunderbolt. The devas then revived Hanuman and blessed him with multiple boons to appease Vayu. Brahma gave Hanuman a boon that would protect him from the irrevocable Brahma's curse. Brahma also said: "Nobody will be able to kill you with any weapon in war." From Brahma he obtained the power of inducing fear in enemies, of destroying fear in friends, to be able to change his form at will and to be able to easily travel wherever he wished. From Shiva he obtained the boons of longevity, scriptural wisdom and ability to cross the ocean. Shiva assured safety of Hanuman with a band that would protect him for life. Indra blessed him that the Vajra weapon will no longer be effective on him and his body would become stronger than Vajra. Varuna blessed baby Hanuman with a boon that he would always be protected from water. Agni blessed him with immunity to burning by fire. Surya gave him two siddhis of yoga namely "laghima" and "garima", to be able to attain the smallest or to attain the biggest form. Yama, the God of Death blessed him healthy life and free from his weapon danda, thus death would not come to him. Kubera showered his blessings declaring that Hanuman would always remain happy and contented. Vishwakarma blessed him that Hanuman would be protected from all his creations in the form of objects or weapons. Vayualso blessed him with more speed than he himself had. Kamadeva also blessed him that the appeal of sex will not be effective on him. So his name is also Bala Bramhachari. ‪#‎TheShivaTribe‬ In this way all of the gods gave Hanuman either a portion of their power or else protection from their power. One version of the story concludes with Brahma making the following sage remarks ~ now hear this Pavanadeva, this son of yours will have the quickest and sharpest mind of all, he will be faster than anyone can imagine and he will be able to change his form at will. He will have tremendous courage and will be known by everyone. During the time of the battle between Rama and Ravana he will take on the form of Rama’s true and devout bhakta [one who performs bhakti]. In this form he will satisfy the spiritual needs of his own bhaktas by filling their hearts with adoration” 
Jai Shri Ram ~ Jai Mahavir Hanuman 🙏🏻🙏🏻