Halakhah su Isaia 66:1

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.