How to 301 Redirect Subdomain Blog to Subfolder /Blog

[Humble_Hustler]

Hi and thanks in advance

Our old sites blog was on a subdomain: blog.website.com/blog-post-etc-so-on-and-so-forth

We are now switching over to a subfolder: website.com/blog/blog-post-etc-so-on-and-so-forth

How do I 301 redirect the the old blog posts to the new blog posts? 

Thank you!