I found the following sentence in the iknow core 1000 step 9:

[![enter image description
here](https://i.stack.imgur.com/EfRrd.png)](https://i.stack.imgur.com/EfRrd.png)

> 夕食に牛肉を買った。 I bought beef for dinner.

に is marking the purpose of buying beef?
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2021-06-23T11:11:37.957
87172
2021-07-01T21:38:14.517
2021-07-01T21:38:14.517
-1
45314
question
grammar particle-に
Using に to indicate purpose without a movement verb
に is for _for_ in that sentence. So yes, it's marking purposes of buying beef.
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2021-06-23T11:43:21.250
87173
2021-06-23T11:43:21.250
45272
87172
answer