Reply To: Making an ohel in the house

Uh, why does etiquette dictate not to open an umbrella in a house?

I’ve heard all sorts of interesting things, and then learned that there are real, halachic reasons for not doing them (usually summarized as ‘it is brought down in seforim hakedoshim’). Examples: Not interleaving one’s fingers, not showing a baby his or her reflection in a mirror until he or she has teeth, not having a bird in the house.

So I thought that someone in CR-land would have a source for this.