Who knows twenty-four?
Please cite/link your sources, if possible. After about one business day, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
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24 things that push salvation farther off and make the time necessary to reach the end of days longer ...
(Braisa DiYishua SheBiPirkei D'Rabi HaKadosh)
I found a link, but it is a give-away to one of my favorite sources! :-)
The letters engraved into the luchot cut through from one side to the other. The holes in the center of the letters Mem and Samech (ם & ס) were held up by a miracle. This occurs 24 times on each side of the luchot (& only in the first five commandments). (Parshat Yisro)
24 traits to acquire the Kehuna (Avot 6:6)
24- are the number of reasons that a person can be put into cherem (Rambam, Hilchos Torah 6:14)
Twenty four is the number of times the word הללוי-ה appears in the Tanach, the majority of the appearances occurring in the later chapters of Sefer Tehillim.
24 - is-- as recounted in Ketubot 62b-63a-- the number of years that R' Akiva studied Torah... and subsequently attributed his Torah learning to his wife who encouraged him to do so.
As R' Akiva states in the above gemara:
שלי ושלכם שלה הוא
my Torah knowledge and yours [ie his talmidim] is actually hers
24 is also the number (in thousands!) of talmidim that R' Akiva brought back with him.
Reish Lakish would ask Rebbi Yochanan 24 questions when they learnt together - Bava Metziah 84a
24 is the number of things that prevent repentance.