Siman 420

The Tur wrote that on Rosh Chodesh it is forbidden to deliver a funeral oration, as we learned (at the end of Moed Katan) that on Rosh Chodesh women may wail and clap. "Wailing" is when they all respond in unison, and "clapping" is palm against palm. But they may not lament, and after the deceased has been buried—they may neither wail nor clap. And "lamenting" is defined as when one woman speaks and all the others respond after her, see there. And there is room to doubt his intention: whether specifically after the burial it is forbidden to deliver a funeral oration, just as it says there that after the burial they may neither wail nor clap, but before the burial it is permitted. Or perhaps: even before the burial it is forbidden, for a funeral oration is similar to lamenting. And so it appears, because in a funeral oration the orator also speaks and arouses weeping—it is like lamenting. Our teacher, the Beit Yosef, did not mention anything regarding the case of a funeral oration. However, for a sage in his presence—it is certainly permitted, and it is also a mitzvah and an obligation. For even on Chol HaMoed they said there in the Gemara: there is no Moed in the presence of a Torah scholar, and all the more so on Rosh Chodesh.

And regarding the matter of tziduk hadin, the Tur brought that the people of Worms disagreed with the people of Mainz. Our teacher, the Beit Yosef, ruled that one says tziduk hadin and kaddish. But the custom is not so, as our teacher, the Rema, wrote. And it is not specifically Rosh Chodesh, for the same law applies to all days on which Tachanun is not said. Similarly, on Friday afternoon and the eve of a Yom Tov after midday – one does not say tziduk hadin. And they may say kaddish over a psalm of Tehillim, and such is our custom that we say Psalm 49 and say kaddish. However, it is obvious that for a great man – one must say tziduk hadin and kaddish, for we also eulogize him. So too wrote the Tur (and so they testified regarding the Rema, of blessed memory). And at night, one says neither tziduk hadin nor kaddish.