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$ man sshd
[...]
SEE ALSO
     ..., sshd_config(5), ...
 
$ man 5 sshd_config
/user
     AllowUsers
             This keyword can be followed by a list of user name patterns,
             separated by spaces.  If specified, login is allowed only for
             user names that match one of the patterns.  '*' and '?' can be
             used as wildcards in the patterns.  Only user names are valid; a
             numerical user ID is not recognized.  By default, login is
             allowed for all users.  If the pattern takes the form USER@HOST
             then USER and HOST are separately checked, restricting logins to
             particular users from particular hosts.
 
nnn
 
     DenyUsers
             This keyword can be followed by a list of user name patterns,
             separated by spaces.  Login is disallowed for user names that
             match one of the patterns.  '*' and '?' can be used as wildcards
             in the patterns.  Only user names are valid; a numerical user ID
             is not recognized.  By default, login is allowed for all users.
             If the pattern takes the form USER@HOST then USER and HOST are
             separately checked, restricting logins to particular users from
             particular hosts.
[End]
FILES
     /etc/ssh/sshd_config
             Contains configuration data for sshd.  This file should be
             writable by root only, but it is recommended (though not neces-
             sary) that it be world-readable.
q
$ su
Password: ******
# vim /etc/ssh/sshd_config