AN EVENT FROM MAHABHARAT
Since Hanumanji is one of the Chiranjeevis (immortals), he has a boon to live forever. This story date back to Mahabharat days. During the Vanvas (exile) period of Pandvas, a pleasant flower breeze flew in the direction where Draupadi ( queen of the pandavs) was resting. She loved the smell and asked Bhim ( A Pandav) to get her a Lotus flower. Bhim and Hanuman
Bhim answered, Oh! its nothing. I will bring you in a second. He searched the forest for that fragrance and as he was about to reach there he found a monkey sleeping on the road.
Bhim did not recognize him and said, Oh, you old monkey, move away from the road. I am on a task and you are delaying it. I am a strong warrior.
Hanuman replied politely, Move my tail off the road first and then I will move away. Bhim the strongest of the Pandavas smirked and tried to lift Hanumans tail with one hand but to his surprise it felt as if it was stuck to the ground. He applied his full force but was not able to lift Hanumans tail. He realized that this was not an ordinary monkey whom he was messing with.
He prays to him to reveal his true identity and Hanuman reveals his real avatar.Bhim ask for forgiveness and this is how Bhim met Hanuman during Mahabharat times.