Who knows nineteen?
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Nineteen are the Letters of R' Hirsch.
Nineteen are the books of Tanach that the Christians agree count as a single book each.
(Of the 24 books of the Tanach, Christians split each of Samuel, Kings, Chronicles, Ezra/Nechemiah, and Trei Asar into two or more books. That leaves nineteen. 5 of the Chumash + 5 Megilos + Yehoshua Shoftim Yishaya Yirmiya Yechzkel + Tehilim Mishlei Iyov + Daniel = 19. )
19 were the years that Am Israel dwelled in Kadesh, and nineteen years they were wandering about aimlessly (see Rashi in Devarim 1:46)