'Minister' in the Bible

Now I have applied these things [that is, the analogies about factions] to myself and Apollos for your benefit, believers, so that you may learn from us not to go beyond what is written [in Scripture], so that none of you will become arrogant and boast in favor of one [minister or teacher] against the other.

Do ye not know that they which minister about holy things live of the things of the temple? and they which wait at the altar are partakers with the altar?

Now I beseech you, brethren (ye know the house of Stephanas, that it is the firstfruits of Achaia, and that they have set themselves to minister unto the saints),