The Haftarah for Pinchas

In most years, Parshas Pinchas falls during the three weeks and, as a result, its haftarah is Divrei Yirmiyahu, the opening words of the book of Yirmiyahu, which is the first of the telasa deparanusa, the three special haftaros we read during the "Three Weeks" of our national mourning (Rishonim quoting Pesikta). This haftarah is usually printed in the chumashim as the haftarah for Parshas Matos.
Since in Eretz Yisroel this is one of the fairly rare years when Parshas Pinchas is read before the fast of the seventeenth of Tamuz, there the haftarah printed in the chumashim for Parshas Pinchas is read. The haftarah, which is from the book of Melachim and begins with the words Ve'yad Hashem, describes how Eliyahu admonishes the wicked monarchs Achav and Izevel. Since the Torah reading and the haftarah reading respectively mention the attributes of zeal demonstrated by Pinchas and Eliyahu, this haftarah is very appropriate for this Shabbos. Furthermore, the Midrash (Pirkei D’Rabbi Eliezer, end of Chapter 29; Midrash Rabbah on this week's parsha) states that Pinchas was Eliyahu, thus providing another reason to read this haftarah on this Shabbos.
It is actually unclear whether the Midrash means that Pinchas and Eliyahu were the same person, particularly since other sources in Chazal identify Eliyahu as being either from the tribe of Binyomin or of Gad (Bereishis Rabbah 71:9), both of which are impossible if Eliyahu was Pinchas, who was a kohen. The Gemara may simply mean that Eliyahu exhibited the same personality traits as Pinchas, since both displayed tremendous zeal in upholding Hashem's honor.
The haftarah quotes Eliyahu as saying to Hashem: Kano kineisi laHashem Elokei Tzeva'os ki azvu berischa bnei Yisrael, I have acted zealously on behalf of Hashem the G-d of Hosts, for the Children of Israel have forsaken your covenant (Melachim 1:19:10), an allegation Eliyahu soon repeats (ibid. Verse 14). According to the Midrash, Eliyahu accused Bnei Yisrael of abrogating bris milah. As a response, Hashem decreed that Eliyahu will be present at every bris to see that the Jews indeed fulfill this mitzvah. Chazal therefore instituted that there should be a seat of honor for Eliyahu at every bris (Pirkei D’Rabbi Eliezer, end of Chapter 29; Zohar 93a).
Indeed, Jews view the mitzvah of bris milah dearly, and have accepted to observe this mitzvah in extremely difficult circumstances. Since the mitzvah of milah is so dear, we celebrate it as a happy occasion even during the three weeks and the nine days, periods of time in which we otherwise are accustomed to mourn. For this reason, the mohel, sandek, and parents of the baby may shave or get a haircut in honor of the bris, and during the Nine Days we serve meat meals in honor of the occasion.
We should also remember that Eliyahu is not only the malach habris, the angel who attends the bris, but also represents Pinchas, the bringer and angel of peace

This Shiur is published also at Rabbi Kaganof's site