Ninshuu

Ninshū is the religion and the peaceful precursor of modern ninjutsu created by Hagoromo Ootsutsuki, the first one to understand and teach the mystery of chakra. The teachings of ninshū were meant to give people a better understanding of themselves, as well as others, and lead the world into an era of peace. Ninshū would eventually come to be known as ninjutsu, a more weaponized version of the Sage's teachings.

Hagoromo exemplified his teachings by distributing chakra meant to "connect" people's spiritual energies with one another. It would allow people to understand each other without communication and pray for one another's safety. After being passed over as the successor of ninshū over his brother, and subsequently manipulated by Black Zetsu, Indra Ootsutsuki was the first to weaponize it into ninjutsu. Others followed his footsteps, using chakra to connect their inner spiritual and physical energies together instead of each other. It was Hagoromo's belief that no one's chakra should be so much greater than any other. If the power is accumulated into one person, then it increases the possibility that the person will become arrogant and desire even greater power. In the end, they ended up using their chakra in battle, just as Hagoromo's mother Kaguya did.