#!/bin/bash

NUM_OF_SERVERS=(server1 server2)
SSH_USERNAME=root
SSH_PASSWORD=password
version=$(cat /etc/redhat-release)


for HOST in ${NUM_OF_SERVERS[@]};
  do /usr/bin/sshpass -p $SSH_PASSWORD ssh $SSH_USERNAME@$HOST echo "$version"

echo "The software version for ${NUM_OF_SERVERS[0]} is $version"
echo "The software version for ${NUM_OF_SERVERS[1]} is $version"

 done

bash: -c: line 0: syntax error near unexpected token `('
bash: -c: line 0: `echo CentOS Linux release 7.4.1708 (Core) '
The software version for server1 is CentOS Linux release 7.4.1708 (Core)
The software version for server2 is CentOS Linux release 7.4.1708 (Core)
The software version for server1 is CentOS Linux release 7.4.1708 (Core)
The software version for server2 is CentOS Linux release 7.4.1708 (Core)