Please write the delay routine for me in 8051 assembly language.

First of all, 8052.com is NOT a site where you can request pieces of code to be written for you (well, you can ask for it, but in general you won't get it just like that).

Secondly, you have obviously not taken the trouble of searching this site or the Internet to see if the answer to your question has been given already, which leads to the conclusion that you're lazy.

So search for the answer first and if it is unclear get back with some real questions.