There is a popular idea that seeing a rainbow is a bad sign, as if the world is deserving of a deluge (c"v) and the only reason Hashem does not do so is because of His promise. Is there any source for ...
What is the source of the Magen Dovid (Star of David) in Rabbinic Judaism? When was it first used, and for what?
Does the Halacha allow the use of a hamsa as a good luck charm, considering that it originated as a Muslim symbol?