Why does the Torah juxtapose the Parshah of Erchin next to the Kelalos?
1.
Ba'al ha'Turim: Because the total of all the evaluations of the various Erchin adds up to 143, the equivalent of the 45
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Kelalos in Bechukosai plus the 98 in Ki Savo.
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2.
Sifsei Kohen
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(2): This is to show that the curses are not a punishment, rather, to refine Yisrael and enable them to endure forever, for Hashem cherishes and esteems everyone! Refer to 27:2:3:4.