12 to equip his people for works of service, so that the body of Christ may be built up

Read Ephesians 4:12 Using Other Translations

For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:
to equip the saints for the work of ministry, for building up the body of Christ,
Their responsibility is to equip God’s people to do his work and build up the church, the body of Christ.