Comentario citado sobre Levítico 21:7

המגרש...רבי אליעזר מתיר – The reason of Rabbi Eliezer, as is written (concerning the laws of the Kohanim) (Leviticus 21:7): “nor shall they marry one divorced from her husband. [For they are holy to their God].” Even if they were not divorced from other than their husband, since he said to her: You are divorced from me, but you are not permitted to all [other] men, is for she is forbidden to the priesthood. So we see that it is a Jewish bill of divorce, and here she is permitted to any men except from this, she is permitted to others.

מקושר מאחוריו – he (i.e., the scribe) writes one line or two and wraps them on the blank part and sews it. And one witnesses inscribes on the wrapping from the outside, and he (i.e., the scribe) goes back and writes two lines from the inside and wraps them on the blank part and the second witnesses inscribes on the wrapping from the outside. And similarly, the third witness. But the Rabbis established a folded document because of stringent Kohanim, because they would write a bill-of-divorcement suddenly to their wives and then regret it and they wouldn’t be able to restore them (i.e., because a Kohen cannot marry a divorced woman – see Leviticus 21:7), and the Rabbis ordained for them a folded bill-of-divorcement which is not easy to write quickly, lest in the midst of it, he is pacified. And just as they ordained/instituted a folded document for a Get, so they instituted for other documents that the Sages did not disagree with.

A high priest who marries a widow, an ordinary priest who marries a divorcee or a halutzah; This section lists marriages forbidden to high priests and ordinary priests. They are listed in Leviticus 21:7, 13-15.

קדשים תהיו YE SHALL BE HOLY — This means, keep aloof from the forbidden sexual relations just mentioned and from sinful thoughts. [It is evident that this is the meaning of קדשים תהיו because] wherever you find in the Torah a command to fence yourself in against such relations you also find mention of “holiness". Examples are: (Leviticus 21:7) “[They shall not take] a wife that is a harlot, or a profane etc.", and in the next verse "for I, the Lord, who sanctifieth you, [am holy]"; (Leviticus 21:15) “Neither shall he profane his seed (by the forbidden unions mentioned in the preceding verses) for I the Lord do sanctify him"; (Leviticus 21:6) "They shall be holy… followed by (v. 7) "[they shall not take] a wife that is a harlot or a profane" (cf. Vayikra Rabbah 24:4-6).