Before you come to my city just know yourself
Know where you at

from Drake (Ft. Dennis Graham & J. Cole) – Jodeci Freestyle Lyrics on Rap Genius

Meaning

Although Drake can mean this:

“Before you come to my city just know yourself” — Know who you are as a person so you won’t get lost (within the street life).
“Know where you at” — Know which area to be in and which area to not be in.

He can also be indicating that,

If anyone plans to come to the city in which he reps “Toronto” they should know who Drake is, as he is running that town and has built the map for it in the music industry. It would be kind of hard to break his career and and take shots at him as he is one of the most successful rappers, he even won a Grammy- Add that to the resume.

In “5AM in Toronto”, Drizzy says:

I got a gold trophy from the committee for validation

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