Is it forbidden to walk four amot with one's head uncovered, and does this prohibition apply at home, while seated, and in our times as a matter of law or merely piety?
Synopsis
The Gemara records Rav Huna's pious practice not to walk four amot uncovered. The Mechaber rules this is obligatory. Later authorities debate whether it extends to shorter distances, to sitting at home, and whether it is now a legal prohibition rather than just a pious standard.
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