Giving for Evangelism - Bible Study

Is there any good reason why a believer would want to give to evangelism? Are there any examples?

Verses used in this Bible study:
1 Corinthians 16:1,2
Matthew 6:19-21
2 Corinthians 11:7-9
1 Thessalonians 2:1-11
1 Thessalonians 3:2
Philippians 4:15-17
2 Timothy 3:17,18
2 Thessalonians 3:7-9
Acts 18:1-3
Acts 17:1-5