RedHat is an enterprise operating system and is not available for free. Hence we cannot download and share the RedHat iso file. 
However you can download an evaluation version from Redhat website which is valid for 1 month by creating a Personal Account on Redhat using your Corporate email id.
You can create an account using the below link:
** Please use your Personal account using corporate email id. Incase you use your personal email id it will not allow you to download the evaluation version
Once you have created the account please login and go the below link:
Scroll down and click on Redhat Linux Server. Refer to the below link:

Once done you can follow the steps shown on the page and download the iso file.

I hope this helps and will resolve your query. Please let us know if you need any further help.