Parshat Eikev – Parshiyot of Tefillin (Petuchah vs Setumah)

(36) He should make all the chapters be open [at the beginning of the line] except for the last chapter that's written in the Torah which is And it will be if you listen, which is made closed [starting in the middle of the line], and if this is changed it's invalid. Rema: and there are those that validated it if all of them are open, and in our cities the custom is that even the chapter of And it will be if you listen is [written] at the beginning of the line like the other chapters. And therefore the custom is that the chapter of Sanctify to me, And it will be when he will bring you, and the chapter of Listen (the first one) [starts] at the beginning of the line, and at the end of Sanctify to me and at the end of And it will be when he will bring you we leave a space the enough to write nine letters, and at the end of [the chapter of] Listen we don't leave any space at all, and if we do leave it should be less than enough [space] to write nine letters. And the chapter of And it will be if you listen we start it in the middle of the above line, and one leaves before it space enough to write nine letters, and you will have discovered that three chapters are open according to [the definitions of open] whether it's like the Rambam or like the Rosh, and the last chapter is closed according to the Rambam.