The phrase
"sacred scrolls" refers to important ancient texts or writings that are considered precious and holy in religious or spiritual traditions.
Full definition
NIN - JA is a regular old ninja, who is commanded by his master Nakamura to seek out a bunch
of sacred scrolls.
Chow plays The Monk With No Name, protector of
a sacred scroll which, if read aloud, bestows upon its reader full control of the world.
He gave up his name in 1943 to protect
a sacred scroll.
It is at the start of the game that we learn that Ryu's village has been destroyed and
the sacred scroll Bushido stolen, which is apparently disastrous, being a source of immeasurable power.