John 15:8
8 Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples. John 15:16 

16 Ye have not chosen me, but I have chosen you, and ordained you, that ye should go and bring forth fruit, and that your fruit should remain: that whatsoever ye shall ask of the Father in my name, he may give it you.

Acts 1:8 
8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.

Matthew 24:14
14 And this gospel of the kingdom shall be preached in all the world for a witness unto all nations; and then shall the end come.

Friendship Evangelism - Page 5