Can Tefillin Be Worn Again After Musaf on Rosh Hodesh for a Berit Mila? Rosh Hodesh presents a unique halachic situation. On one hand, it is a semi-Yom Tob , and thus many customs are softened or adjusted. On the other hand, Tefillin are not typically worn during Musaf , as the spiritual "Ot" (sign) of the day is already present in the Musaf offering itself. So what happens when a Berit Mila takes place after Musaf on Rosh Hodesh —can the Tefillin be worn again? Tefillin and Musaf on Rosh Hodesh: What's the Rule? On Rosh Hodesh: Tefillin are worn throughout Shaharit until Musaf . Before Musaf begins , it is customary to remove Tefillin out of respect for the added sanctity of the day. This is based on the idea that Rosh Hodesh has its own "sign"—its Korban Musaf —and we do not "add a sign upon a sign." This is the standard Halacha practiced in both Ashkenazi and Sephardi communities. But What If There Is a Berit Mila After Musaf? If a Berit Mila takes place after Musaf , the question arises: may one put Tefillin back on to enhance the Misva? The answer is: Yes . Hacham Ovadia Yosef, the Ben Ish Hai, and many Poskim rule that one may put Tefillin back on after Musaf for the sake of a Berit Mila . Since the Berit Mila itself is a sign ( Ot ), the Tefillin complement and enhance it. This is not considered adding a sign upon a sign because the Misva of the Berit changes the framework—you're wearing Tefillin not for the day, but for the ceremony. How Should One Do This? Wash hands (Netilat Yadayim) before putting the Tefillin back on. Say Shema Yisrael or learn a small amount of Torah while wearing them. Remove them immediately after the ceremony concludes. Important: One does not recite a new Beracha when re-wearing the Tefillin in this context. The act is an enhancement, not a fresh fulfillment of the daily obligation. What If Someone Already Removed Their Tefillin? If the person already removed Tefillin after Shaharit or Musaf, he may still put them back on for the purpose of the Berit , as long as it's shortly thereafter and not hours later. However, it's ideal to delay removing Tefillin until after the Berit if one knows in advance that a Brit will be taking place. Summary: On Rosh Hodesh, Tefillin are removed before Musaf. If a Berit Mila occurs after Musaf, one may re-wear Tefillin for the ceremony. No Beracha is recited, and they should be removed after the Berit ends.