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I heard in a shiur that work is a bracha that prevents one from sin and allows one to be tested. In which chapter can I find this content?
I think you're referring to the fourth sha'ar, Sha'ar HaBitachon, third chapter (starts at "מדוע האדם צריך לטרוח בעבודה?").
In English (starts at "Why man must work for a livelihood").