"Let us have some tea " he said to me .

Dear Student, 

Your question is incomplete. I am assuming that the question is:
Convert the following sentence in reported speech :
"Let us have some tea," he said to me.

Accordingly, here is the answer:

He proposed to me that we should have some tea. 

​​​​​​If this was not what you had in mind, please re-post the clear question in a new thread. Our experts would be happy to help you there.

Regards,