In yeshiva, I saw that the Rabbis had a custom to put (the first) snow on their forehead.
What is the source of this custom?
This was in Jerusalem.
There is such an idea from the Arizal that if one wants a segulah for a good memory they should place snow on their forhead since the gematria for (שלג(333 is the same number value as the word( שכחה(333. Don't remember such a thing that it has to be first snow.
I just found in the Segulas Yisrael this idea of first snow from the Kanfei Yonah