English: “You shall not add to it and you shall not subtract from it” — It was taught: From where do we know that one may not add to the lulav or to the tzitzis and may not diminish from them? From the verse “you shall not add to it and you shall not subtract from it.”
On the daf / in context: The general prohibition against adding or subtracting is applied specifically to the fixed number of species of the lulav and the threads of the tzitzis.
Type of Learning
Derash on the verse (Sifrei) — applying the ban on addition/subtraction to specific mitzvos of fixed form.
What Is Learned
One may neither add to nor subtract from the prescribed form of the lulav and of the tzitzis.