noun
congregation
kahng-grih-GAY-shuhn/ˌkɑːŋɡrɪˈɡeɪʃn/
People or things assembled together.
The congregation sits together in the pews facing a wooden cross.

Etymology
The flock image underlies both the act of gathering together and the assembled group. Biblical translation and religious use helped specialize this general assembly into a community gathered for worship.
In context
So the assumption in Hebrews 13 is that this congregation of Hebrew believers have legitimate, honest, faithful shepherds and they need to follow those shepherds.
More examples
- A small congregation of neighbors gathers outside the town hall.
- The congregation welcomes new members after the service.
- A noisy congregation of gulls fills the harbor.
Forms
congregation · congregations
congregate verb — To come together in a group.