"Av harachamim" is a prayer asking God to recall those who died al kidush hashem. It was written in response to the First Crusade (and is thus said only in the Ashk'nazi rite). Because of its somber topic (or origin), it is omitted on various joyous occasions, though which occasions qualify varies widely. It is also, according to some views (cited in Mishna B'rura 685) and in many synagogues, omitted when the "four parashiyos" are read. Why omit it when the "four parashiyos" are read? That's not a particularly joyous occasion.
kind of related: judaism.stackexchange.com/questions/29300/…– MenachemJul 5, 2013 at 2:42
I always assumed that the reason was because the four parshiyos represent a time of celebration (due to the 'redemption' period of Adar and Nissan, as per Rashi Taanis 29a). Even though this is true of the entire month of Adar, on the week(s) without special parshiyos its celebratory period isn't expressed, so we don't need to suppress the spirit-dampering prayer of Av Harachamim– הנער הזהFeb 25, 2015 at 2:01
But I bet if you check the Nittei Gavriel or Piskei Teshuvos he gives answers... no?– הנער הזהFeb 25, 2015 at 2:02
First of all, it should be noted that there is a custom to say "Av Harachamim" on the four Parshios-Shabbosos as well. The custom not to say it is in the Darkei Moshe in the name of the Maharail (Siman 685), and seems to be the custom of the Magen Avraham and R. Yaakov Lorberbaum of Lissa (in his Siddur, Derech Hachayim). However, the Eliyah Rabba (685:18) and Shaarei Efraim there mention the custom to say Av Harachamim even during the 4 parshios.
However, the Aruch Hashulchan (685:9) seems to approve of the custom to omit the prayer, because these Shabbosos have a festive air about them, just like the Shabbos Mevarchim.1 It sounds like anytime when something special is done regarding the leining, there's a feeling of happiness (because there are more kibbudim to be given out if there's another Sefer Torah, maybe? I'm not sure).
R' Yaakov Emden (Mor Uktziah 685:10) writes that once Adar has entered, "מרבים בשמחה", we increase our joy, and don't want to dampen that joy with the somber prayer of Av Harachamim.2 (Even though there are week(s) in Adar without an extra parsha, I assume that this isn't an issue because the festive nature of the month isn't express in any halacha during that week/weeks)
My understanding has always been that these parshiyos are related to the holidays around which they are centered (Purim and Pesach), and so the season, at least on a Shabbos when that feeling is being expressed by the "four parshiyos", should be a joyous one.
1 "ולעניות דעתי נראה שלא לומר כיון שאין מזכירין נשמות והם שבתות של שמחה ולא גריעי משבת שמברכין בו את החודש"
2 "במגן אברהם הביא בשם מהרי״ל שבכל ד׳ פרשיות אין מזכירין נשמות… לא נודע לי טעם בפרשת שקלים אבל בפרשת זכור שכבר נכנס אדר שמרבין בשמחה נ״ל שנכון מנהג מהרי״ל וכ״ש בשתי פרשיות שלאחר פורים שהם בין גאולה לגאולה דהוי מנהגא"
I would also add that skipping Av Harachamim on Shabbos Zachor just sounds strange.– YitzchakFeb 25, 2015 at 21:49
Mishna Berura 685:18 actually brings a dispute as to whether we say Av HaRachamim during the weeks of the 4 Parshios. Minhag Chabad is to say on Parshas Zachor and on Parshas Para מפורש בלוח 'היום-יום' לש"פ זכור ופרה שאומרים 'אב הרחמים', however do not say it on Parshas Shekalim or HaChodesh since we are either Bentching Rosh Chodesh or it is Rosh Chodesh.
I have yet to see a reason mentioned anywhere for those that do not say it - other than "we do not say it". My own thought is perhaps there is increased Simcha in taking out a second Sefer Torah.
I wonder what the -1 was for -- seems reasonable answer to me. In general it is a strange practice to downvote without explanation...– gt6989bMar 6, 2013 at 22:37
2@gt6989b Well, the answer spends half the time discussing opinions the OP deliberately excluded, and the other half speculating.– Double AA ♦Mar 6, 2013 at 22:59
@gt6989b meta.judaism.stackexchange.com/a/146– msh210 ♦Mar 7, 2013 at 6:46
Those that omit Av Harachamim do so because the Four Parshios are to some extent celebratory, in that they usher in and remind us about the oncoming festival of Pesach. The poskim failed to make this explicit because they mistakenly presume that the reader would realize this on his or her own. Of course, my assertion is, by its very nature, difficult to prove.
1Thanks for your answer and welcome to Mi Yodeya. I hope you stick around and enjoy the site. Please consider registering your account, which will give you access to more of the site's features.– msh210 ♦Mar 6, 2013 at 22:25