Dear friend, you are being faithful to God when you care for the traveling teachers who pass through, even though they are strangers to you. They have told the church here of your loving friendship. Please continue providing for such teachers in a manner that pleases God. For they are traveling for the Lord, and they accept nothing from people who are not believers. So we ourselves should support them so that we can be their partners as they teach the truth. 3John 5–8 (NLT)
The simple principle from these verses is that it is the local church’s responsibility to support the work of the Gospel where it is being done among unbelievers. As you can read it is not a matter of personally knowing those serving in other lands but that we are called to partner with them because it pleases God. Pretty clear. By God’s grace, it’s not only others who benefit when we give.