סימן להימים שקוראים בהם הלל שלם
The Medrosh on the verse (Bereshis 7, 9) נח אל באו שנים שנים, says that this is an allusion the days that we complete the Hallel, but without further explanation. Therefore, we could say as follows:
The days that we say a complete Hallel are: the first two days of Pesach, the two days of Shavous, the nine days of Sukkos, and the eight days of Chanukah.
And this verse serves as a device to remember these days:
- שנים – Two days of Pesach
- שנים – Two days of Shavous
- באו – numerical value is 9 – nine days of Sukkos
- נח אל- numerical value is 89 –same numerical value as חנוכה
נשמת כל חי תברך את שמך
The prayer uses the language of “all living things” not to limit the praise to that which comes from humans, but to also include praises that comes from any creation that has the breath of life. And, that is similar to the language used in the verse (Bereshis 7, 22) that included in the drowning of the Flood were כל אשר נשמת רוח חיים, which indicates all living creatures.
This prayer is probably referring to the different creatures that praise G-d as recorded in Perek Shirah. We do not know who authored Perek Shirah, but the concept that animals and birds praise HaShem is mentioned many times in the Gemara (see Sanhendrin 95b, Avodah Zarah 24b and Chullin 64b).
אברים שפלגת בנו
The word "שפלגת" can have two implications.
The first implication is separation and opposition as in Tehilim 55, פלג לשונם. This word is used often in Gemara במאי קמפלגי, פליגא. Further, this implication is involved in the title חכם מופלג, that such a person is separated to a higher level than others in terms of wisdom and knowledge (also, עשיר מופלג, etc.).
According to this first implication, the verse infers that we have various separated limbs yet we unite them to praise the Creator.
The second implication of "שפלגת" is one that investigates and arranges items to their parts and functions, like the verse (Bereshis 10, 25) בימיו נפלגה הארץ. It is understood that this verse means that in his days the land was arranged according to the differing settlements.
According to this second implication, we can understand the phrase in the prayer means that one’s limbs are arranged according to each function and proper place, and yet unite to praise HaShem.