# until the full number ... were to be killed

This implies that God had decided that a certain number of people should be killed by their enemies.

# their fellow servants and their brothers and sisters

This is one group of people described in two ways: as servants and as brothers and sisters. Alternate translation: "their brothers and sisters who serve God with them" or "their fellow believers who serve God with them"

# brothers and sisters

Christians are often spoken of as being one another's brothers and sisters. Alternate translation: "fellow Christians" or "fellow believers" (See: [[rc://en/ta/man/translate/figs-metaphor]])