Priests

In the Old Testament Priests Are the Keepers of the Sacrifice
Ezekiel 44:15
  15 ¶ But the priests the Levites, the sons of Zadok, that kept the charge of my sanctuary when the children of Israel went astray from me, they shall come near to me to minister unto me, and they shall stand before me to offer unto me the fat and the blood, saith the Lord God:


2 Chronicles 35:10-14

  10 So the service was prepared, and the priests stood in their place, and the Levites in their courses, according to the king’s commandment.

  11 And they killed the passover, and the priests sprinkled the blood from their hands, and the Levites flayed them.

  12 And they removed the burnt offerings, that they might give according to the divisions of the families of the people, to offer unto the Lord, as it iswritten in the book of Moses. And so did they with the oxen.

  13 And they roasted the passover with fire according to the ordinance: but the other holy offerings sod they in pots, and in caldrons, and in pans, and divided them speedily among all the people.

  14 And afterward they made ready for themselves, and for the priests: because the priests the sons of Aaron were busied in offering of burnt offerings and the fat until night; therefore the Levites prepared for themselves, and for the priests the sons of Aaron.

In Our Day One of the Priests Duties Is the Sacrament
Doctrine and Covenants 20:46-47

  46 The priest’s duty is to preach, teach, expound, exhort, and baptize, and administer the sacrament,

  47 And visit the house of each member, and exhort them to pray vocally and in secret and attend to all family duties.