The pidyon haben or redemption of the first-born son is a mitzvah in Judaism whereby a Jewish firstborn son is "redeemed" with money.
Pidyon haben
The silver tray, the silver coins and the glass for the wine
Redemption of the First-born (1724), from Juedisches Ceremoniel
Pidyon haben coin from Israel, 1974. In the collection of the Jewish Museum of Switzerland. Such coins are offered in sets of 5 by the Bank of Israel.
Kohen is the Hebrew word for "priest", used in reference to the Aaronic priesthood, also called Aaronites or Aaronides. They are traditionally believed and halakhically required to be of direct patrilineal descent from the biblical Aaron, brother of Moses, and thus belong to the Tribe of Levi.
The high priest in his golden garments (the chain censer depicted is anachronistic).
The priestly breastplate of the high priest.
Kohen, Kohen Gadol and a Levite (Charles Foster, 1873)
A group of kohanim studying the Mishnayot laws of Keilim in anticipation of the rebuilding of the Beit Hamikdash