If you would like to display a login banner for SSH users on RHEL, you can. This is quite easy, however, this isn't the same as a message of the day (MOTD) banner; which is why this post even exists. Usually the file for the banner is located at /etc/banner.

To actually implement (or remove) the banner message you would just add (or remove) the Banner stanza in the sshd_config file for your SSH server. This is usually located in /etc/ssh/sshd_config.

Non-Configured (disabled) Banner

cat /etc/ssh/sshd_config | grep -i Banner
Banner none

OR

cat /etc/ssh/sshd_config | grep -i Banner
#Banner none

Configured Banner

cat /etc/ssh/sshd_config  | grep -i Banner
Banner /etc/banner