New Testament...

II Timothy 4:5
4:5 But watch thou in all things, endure afflictions, do the work of an evangelist, make full proof of thy ministry.


    By Revelation...

DC 125:3-4
125:3a The patriarch is an evangelical minister. The duties of this office are to be an evangelical minister; to preach, teach, expound, exhort, to be a revivalist, and to visit branches and districts as wisdom may direct, invitation, request, or the Spirit of God determine and require;
125:3b to comfort the Saints; to be a father to the church; to give counsel and advice to individuals who may seek for such; to lay on hands for the conferment of spiritual blessing, and if so led, to point out the lineage of the one who is blessed.
125:4a He is to be free from responsibility--ministerial--as a traveling minister, and from the care of the local branch or church and district affairs.