Halakhah zu Tehillim 137:6
תִּדְבַּ֥ק־לְשׁוֹנִ֨י ׀ לְחִכִּי֮ אִם־לֹ֪א אֶ֫זְכְּרֵ֥כִי אִם־לֹ֣א אַ֭עֲלֶה אֶת־יְרוּשָׁלִַ֑ם עַ֝֗ל רֹ֣אשׁ שִׂמְחָתִֽי׃
Kleben möge meine Zunge mir am Gaumen, wenn ich dein nicht gedenke, wenn ich nicht erhebe Jerusalem auf den Gipfel meiner Freude.
Kitzur Shulchan Arukh
Should any of these four fast days occur during the bridegroom's seven days of wedding feast, although these days (of the wedding feast) are considered to him as a Yom Tov, nevertheless, he must fast.1This law also applies when any of these fast days is postponed, as stated in paragraph 6. A groom must fast even on a postponed fast day. (Mishnah Berurah 559:9,35) Since his Yom Tov is only a personal celebration, the public mourning and fasting overrides it, and also, because it is written, "… if I fail to elevate Jerusalem above my foremost joy" (Psalms 137:6).
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