Halakhah su Isaia 66:26

Therefore G-d found it necessary to create man on the sixth day, and He created him with competing drives: Man possesses a spiritual soul that enables him to recognize the creator as does an angel, as the verse states: “Man’s soul is G-d’s lamp…” (Mishlei 20:27). He also possesses an animalistic nature due to his physical body, which drives him to animal behaviors, such as eating, drinking, and sleeping.This state of affairs gives rise to a constant struggle within man all the days of his life, with his animal nature pining for physical desires, while his pure soul opposes such pursuits, inspiring man to turn to his real purpose, to serve G-d like an angel. His soul further insists that even necessary physical needs, such as eating, drinking, and sleeping, should be done with intent to better serve G-d, and on this the verse has been stated: “I have placed G-d before me constantly.” (Psalms 16:8). After man’s death he is shown on high that all his actions were recorded, as though in a book, with his own signature. If he has followed the path of Torah and mitzvos, he inherits heaven (Lit. 'Gan Eden') which is a limitless and endless spiritual joy. Of these people the verse proclaims "They will be sated from the fat of Your house, and with the stream of Your delights You give them to drink. For with You is the source of life; in Your light we will see light. " (Psalms 36:9). If G-d forbid his actions were the opposite, he inherits Gehenom, to which all the pains of this life are as naught in comparison. On these people the verse states: "And they shall go out and see the corpses of the people who rebelled against Me, for their worm shall not die, and their fire shall not be quenched, and they shall be an abhorring for all flesh." (Yishayahu 66:24). There are seven descriptions given to Gehenom: Nether-world (or Sheol), Destruction, Pit, Tumultuous Pit, Miry Clay, Shadow of Death and the Underworld. (Eruvin 19a). One who is seduced by his base inclinations falls there, and that is why it is also called 'seducer', as the verse states "For Tophteh (Heb. related to the word 'seduce') is set up from yesterday, that too has been prepared for the king (Sennacherib and his army), it deepened, it widened its pile, of fire and much wood; the breath of the Lord is like a stream of brimstone, burning therein.(Yishayahu 30:33). (Eruvin 19a).

Despite the contrary view of Rabbenu Tam cited by Tosafot, Nazir 54b, the accepted view is that a kohen incurs no transgression in coming into contact with metal defiled by a corpse. As quoted in the comments of Tosafot, that position was formulated by Rabbenu Chaim Kohen who responded to Rabbenu Tam with a pithy comment based upon the verse "What house will you build for Me?" (Isaiah 66:1). The import of Rabbenu Chaim Kohen's retort is that, particularly in medieval times, there was no house that did not sooner or later become defiled through the presence of a corpse and hence no building that, following Rabbenu Tam's position, a kohen may enter. Rabbi Chaim Kohen's position is espoused by Rambam, Hilkhot Avel 3:2, and Rema, Yoreh De'ah 369:1.

Beginning with the Shabbos following Tishah beAv and after that, for the next seven Shabbosos we read the haftoras "sheva denechamasa" [seven haftoras of consolation]. If the first day of Rosh Chodesh Elul occurs on Shabbos, the haftorah, Aniyah so'arah, is set aside ["O you afflicted, floundering in the storm,"] (Isaiah 54:11) and we read instead, "Hashamayim kis'i," [The heaven is My throne] (Isaiah 66:1), because this haftorah also contains consolation for Jerusalem. On the Shabbos of Parshas Ki Seitzei, when the haftorah Roni akarah [Sing, O barren woman] (Isaiah 54:1) is read, we conclude the haftorah with Aniyah so'arah, which is next to it. If, by mistake, on Shabbos Rosh Chodesh Elul, you said Aniyah so'arah, and you became aware of it before saying the concluding berachos, you should also say Hashamayim kis'i, and then say the concluding berachah. If you only became aware [of your error] after saying the concluding berachos, then you should recite, Hashamayim kis'i without the berachos. If Rosh Chodesh Elul occurs on Sunday, the haftorah, Machar Chodesh is set aside, [Tomorrow is Rosh Chodesh] (I Samuel 20:18), because it contains no consolation for Jerusalem, and the haftorah Aniyah so'arah is read.