Reference for Berakhot 31:23

אם כן לימא קרא בלכת מאי בלכתך שמע מינה בלכת דידך הוא דמחייבת הא דמצוה פטירת

In that case, the All-merciful should have written "when walking." What means "when thou walkest"? Deduce from this, [it means] when walking for thine own purpose thou art under the obligation [to read the Shema'] ; but when it is the performance of a religious duty, thou art exempt.

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