Halakhah zu Dewarim 22:8

Said Rav Yitzchok the son of Rav Yehudah, "One should always plead for mercy that he should not get sick, for if one falls sick, he is told, 'Demonstrate your merit and you will be acquitted.'" Said Mar Ukva, "From which verse in the Torah is this inferred?" From the verse, "Lest any man fall from (mimenu) there."¹Deuteronomy 22:8. From within himself (mimenu) he must produce evidence; which means, since he has fallen, he must produce from within himself and from his deeds, evidence of his merit."²Maseches Shabbos 32a. It is also stated in the Talmud,²Maseches Shabbos 32a. "If a person has a headache he should view it as if he were put in chains. If he becomes ill and is confined to bed, he should view it as if he were placed onto a scaffold, (a place where capital cases are tried) for trial. Anyone who is placed onto the scaffold for trial, if he has great advocates, may be saved. But if he has none, he cannot be saved. These are the advocates of man: repentance and good deeds. Even if nine hundred and ninety-nine accuse him, and only one advocate defends him, he is saved, as it is said, "If there be for him an angel, an advocate, [even] one among a thousand, to vouch for man's uprightness, then he is gracious unto him, and says, 'Redeem him from going down to the pit.'"³Job 33:23, 24.

It is a positive commandment to make a fence on one's roof as it says "and you shall make a fence for your roof". This applies if it is a dwelling place, but a storage house or a cattle house and the like do not require one.

A house of two partners is obligated to have a fence around its roof, as it says “lest any one fall from it”. This is applicable whenever someone is liable to fall. If so, why does it say “your roof”? To exclude synagogues and study halls, since they are not made for residence.