If you speak the Mahamritunjay mantra every day, you will become immortal, and all your ailments will vanish. Long-Lived Markanda Rishi mentioned the nobility of the Mahamritunjay Mantra in his mythological storey. The storey of Sanat Rishi, who blessed the child with long life, was also reported. However, he later discovered that a child's life span is just ten years. Kala (the God of Time) moves at his own pace.
Lord Shiva instituted (or gave) the Maha Mrityunjaya mantra to Rishi Markandeya. When King Daksh cursed Chandra Dev, this mantra was used to save his life. It is one of the Vedas' most powerful mantras, containing Lord Shiva's strength and capable of resolving any issue.
It is made up of three Hindi words: "Maha," which means wonderful, "Mrityun," which means death; and "Jaya," which means victory, resulting in victory over death. Read more https://www.trimbakeshwar.org/mahamritunjay-jaap