Query: Whether the commission of our Lord and Savior Jesus Christ
... does not require of the church to send brethren to
preach the gospel, where the name of Christ is not known?
Answer: Considered, that the Brethren acknowledge the great commission
of Christ to its full extent, and that it is the duty of the church,
the ministers, and every private member,
to do all that is in their power to fulfill that commission
in accordance with apostolic practice.
Source: Let our Joys Be Known