How to fetch rocky linux kernel source code

I am a green hand of rocky linux.
I need to rebuild the kernel of rocky linux 8.5 to make it work better on my workstation,the source code is not found in the iso.
So where can I download the kernel source code?

The following command will download the latest kernel src.rpm:

$ dnf download --source kernel

Thanks a lot for your reply.
Inspired by your advice, I have fetched the source code package I need.