שחרי' נכנסים לבית הכנס' וקורין הזמירו' של שבת ומתפללין תפלת שחרי' וגומרין ההלל (ומברכין לקרות ההלל) ואין מפסיקין בו אלא כדרך שאמרו בקריא' שמע באמצע הפרק שואל בשלום אביו או רבו ומשיב שלום לאדם נכבד שנתן לו שלום ובין הפרקים שואל בשלום אדם נכבד ומשיב שלום לכל אדם: הגה ודוקא בב' ימים הראשונים שגומרים בהם ההלל דינא הכי לענין הפסקה אבל בימים שאין גומרים (ע"ל סי' תכ"ב סעיף ד') : ואם פסק באמצע ושהה אפי' כדי לגמור את כולו אינו צריך לחזור אלא למקום שפסק:

The Laws of the Morning Prayer on Passover (Three Sections):In the morning, people enter the synagogue, recite the zemirot (psalms) of Shabbat, pray the Shacharit (morning) prayer, and complete Hallel (reciting the blessing “to recite the Hallel”). One should not interrupt during Hallel, except in the manner permitted during the recitation of Shema—in the middle of a paragraph, one may greet their father or teacher and respond to a greeting from an honored person. Between paragraphs, one may greet an honored person and respond to any greeting.Gloss: This rule regarding interruptions applies specifically to the first two days of the festival when Hallel is recited in full. On the days when Hallel is not completed, different rules apply (see Siman 422, Section 4). If one interrupted in the middle and was silent for as long as it would take to recite the entire Hallel, they do not need to start over but should continue from where they left off.

...During Hallel, even if ten people recite it together, they all fulfill their obligation.

Two Torah scrolls are taken out. In the first, five people are called to read (if additional aliyot are added on Yom Tov, see Siman 482). The reading is from Parashat Bo, starting from "משכו" (Draw out your hands) until "מארץ מצרים על צבאותם" (out of the land of Egypt, by their divisions). The maftir (additional reading) is read from the second scroll in Parashat Pinchas, from "ובחדש הראשון" (On the first month). The Haftarah is from Joshua, starting with "בעת ההיא" (At that time). The Mussaf (additional) prayer is then recited, and from this point forward, rain is no longer mentioned (see Siman 114, Section 3). Likewise, from this point on, one stops requesting rain in the Blessing of the Years. Gloss: It is customary on every Yom Tov, in the Mussaf prayer, to recite the verses of the additional offerings of the day after saying "Through Moses, Your servant, as it is stated...".