Rashi on Deuteronomy 17:8/רש"י על דברים י״ז:ח׳

1כי יפלא IF THERE BE [A THING] TOO HARD [FOR THEE IN JUDGMENT] — The term פלא always denotes separation and being at a distance; it means here that the matter is apart and is hidden from thee.

2בין דם לדם [IF THERE IS ANYTHING TOO HARD FOR THEE IN JUDGMENT] BETWEEN BLOOD AND BLOOD — i.e. between the blood of the menstruous woman that may be unclean blood, and blood that may be clean (Niddah 19a; cf. Sifrei Devarim 152:5),

3בין דין לדין BETWEEN PLEA AND PLEA — i.e. between a verdict of acquittal and a verdict of “guilty”.

4בין נגע לנגע BETWEEN PLAGUE AND PLAGUE — i.e. between a plague that may be unclean and a plague that may be clean.

5דברי ריבה BEING THINGS OF STRIFE [WITHIN THY GATES] — i.e. that the scholars of the city (the judges) be of different opinions in that particular matter (cf. Onkelos), the one declaring it unclean, the other clean, the one sentencing, the other acquitting,

6וקמת ועלית THEN SHALT THOU RISE AND GO UP [UNTO THE PLACE WHICH THE LORD THY GOD SHALL CHOOSE] — This (the phrase “go up”) teaches that the Temple (in the vicinity of which the Sanhedrin sat) was situated higher than all other places in Palestine (Sifrei Devarim 152:15; Sanhedrin 87a). (cf. however, Ibn Ezra on Numbers 16:12.)