Parshas Balak
Ben Yehoyoda.
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(Bilam wanted to curse the Yidden) that their odour might not be fragrant. (Sanhedrin 105b)
This was a curse that they should not increase Geirim. For example when the fragent of a fruit diffuses into the air, it attracts life. So to when the fragent of Torah diffuses into the air it attracts converts.
Indeed the eventual blessing came true with Yissachar and Zevulun.
Yissachar learnt the Torah in Isreal, whilst Zevullun (who supported Yissachar, went overseas to support Zevulun) spread the Torah learnt by Yissachar and increased convert to the Yidden.