Kommentar zu Bereschit 39:20

AND HE PUT HIM INTO PRISON, THE PLACE WHERE THE KING’s PRISONERS WERE BOUND. Rabbi Abraham ibn Ezra says that the verse itself explains that a beth haso’ar (prison) is “a place where the king’s prisoners were bound.” The reason this is stated in the verse itself is that beth haso’ar is an Egyptian word, for it is the style of Scripture to explain foreign words just as, they cast pur, that is the lot.²⁵²Esther 3:7.
This interpretation is of no significance. Rather, And he put him into the prison, means that he put him into a certain prison recognized as the royal prison, which was the place where the king’s prisoners were bound. The sense of the verse is thus to state that this was the cause of the butler and the baker being imprisoned with him.
It is possible that the term, “the king’s prisoners,” means his servants and attendants who have sinned against him in matters of state, as other prisoners of the people sentenced by judges and officers were placed in another prison house. Scripture relates that they placed Joseph in the king’s prison because of his master’s love for Joseph, all of which was caused by G-d.
Linguists²⁵³Here referring to R’dak, who so writes in his Book of Roots, under the term sohar. explain sohar as an arched chamber, similar in expression to, agan hasohar (a round goblet).²⁵⁴Song of Songs 7:3. In my opinion it is an underground house having a small opening above ground, through which the prisoners are lowered and from which they have light. The word sohar is thus derived from the word sihara (light) in Aramaic, just as in Hebrew, Scripture says; A transparency (‘tzohar’) shalt thou make to the ark,²⁵⁵Above, 6:16. the word tzohar being derived from tzaharayim (mid-day — when the light reaches its zenith). The difference between tzohar and sohar is that tzohar connotes an abundance of light, while sohar connotes minimal light.

ויתנהו אל בית הסוהר מקום אשר אסירי המלך, “he placed him in the jail in which the King’s prisoners were kept.” According to Ibn Ezra the term בית הסוהר is a specifically Egyptian term. This is the reason why the Torah found it necessary to explain the meaning of the term by writing that it was the place in which the King’s prisoners were kept. Nachmanides writes concerning Ibn Ezra’s observation that Ibn Ezra made no contribution at all with his excuse for the apparent repetition, but that the letter ה at the beginning of the word סוהר indicates that this was a very well known jail, the one specially reserved for the king’s prisoners This explains why the King’s baker and the King’s cupbearer were placed in that jail where they met Joseph. It is also possible that the wording in chapter 40,3 indicates that prisoners kept in that jail were dealt with by the King personally, and not by regular judges and courts. The Torah’s reporting that this was the jail Potiphar placed Joseph in, is an indication that Joseph was considered as a V.I.P. by his former master.