When the war was going on, Raavan almost killed Lakshman. Vishwamitra was called and he asked Hanuman to go to the mountains and bring the medicine Sanjeevan buti. Hanuman left immediately. When he flew up to the mountains he had no idea what this Sanjeevan buti looked like. He could not recognize it. He had never seen it before. If it were a mango tree or a banana he would have known, but this he had never seen. So he kept looking all over the place and he soon realized he had very little time because Lakshman could die if he did not get the herb (buti) in time. He wanted to stop the day from ending so he swallowed the moon and the sun had to wait for the moon to come out. As Hanuman was quite strong he simply picked up the whole mountain and left. He brought it to Shri Ramnagaria and told Vishwamitra to identify the buti because he did not know which one it was. Vishvamitra took the buti and made a balm and put it on Lakshman who was restored to life again. Hanuman let the moon out but his cheeks remained puffed up.