Having a Separation on one's hand during the service: Eruvin 103b-104a; Rashi Pesachim 57a "Karich"
Permitting a Kohen to replace a plaster on a wound after performing the service on Shabbat or Yom Tov (despite concern he might smear the ingredients), as otherwise he wouldn't remove the plaster for the service: Eruvin 102b; Beitzah 11b
Having a Separation between the Kohen's foot and the floor of the Temple's Outer Room: Eruvin 104a; Pesachim 65b
Having a Separation beneath one foot, assisting in support of the Kohen: Shabbat 93b
Having dirty Clothing while doing Service: Pesachim 65b
The Clothing must be an exact fit for Service: Pesachim 65b
For a Kohen to bring an offering for someone who has vowed renouncing benefit from him: Nedarim 35b-36a
Performing a service for a minor: Nedarim 36a
Practice of turining to the right atop the Altar: Yuma 58b
List of the hardest Services: Yuma 47b
The Service [of the Pesach Offering] was arranged for beauty: Pesachim 64b
Mitzvah of Reading the Purim Story, vs. Service in the Temple: Megillah 3a-b
Mitzvah of Burying a body which has no buriers, vs. Service in the Temple: Megillah 3a-b Interrupting the study of Torah for Service in the Temple: Megillah 3a-b
The Value of Torah Learning, as opposed to that of Temple Service: Megillah 3a-b