i just got a iphone off ebay and i cant get in it because of his apple id, what do i do to get read of it?t

Return it and get your money back. You cannot bypass activation lock. Apple will NOT help you. We CANNOT help you.

Read this --> The All Too Common SAD Reality of Buying … - Apple Community

Activation Lock is a theft deterrent.

It’s intentionally not easily bypassed.

It’s intended to make a lost or stolen an iPhone or iPad unusable.

Contact the seller and get a refund, or contact eBay.

Expect to recycle this device, if the seller has disappeared and as is often the case.

The All Too Common SAD Reality of Buying a used iPad/iPhone - Apple Community

Return it and get a refund if possible.

Turn off Activation Lock - Apple Support

There is no known way to bypass activation lock without the assistance of the previous owner. If the previous owner is willing to help, see instructions in Turn off Activation Lock - Apple Support

If not, you may want to contact ebay as the phone is not usable. See: https://pages.ebay.com/ebay-money-back-guarantee/