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The Gemara discusses the writing of the Parshiyos of Mezuzos and whether they are to be written "Pesuchos" or "Setumos."
What constitutes a Parshah Pesuchah and a Parshah Setumah?
(a) TOSFOS and the ROSH maintain that a Parshah Pesuchah refers to any section of the Torah that ends with space left at the end of the last line of the preceding section (#1 in Graphic), or that has blank space at the beginning of the new section, or both.
A Parshah Setumah refers to any section that ends on the same line on which the next section begins (#4 in Graphic), such that the empty space is in the middle of a line.
(b) The RAMBAM explains that a Parshah Pesuchah refers only to a section that ends with space at the end of the line (#1 in Graphic).
A Parshah Setumah is a section that is followed by empty space at the beginning of the next line, whether the section ends at the end of the line before the line with the empty space or whether it ends in the middle of the line before the line with the empty space . In addition, a Parshah is considered Setumah when the Parshah ends on the same line on which the next section begins (#4 in Graphic), such that the empty space is in the middle of a line.
Much of what is discussed is based on Halacha leMoshe miSinai which we discuss at length.