SSH Passwordless Authentication by expect system call

#!/bin/bash
HOSTS="192.168.0.1"
PASSWORD=Passw0rd@1
for HOST in $HOSTS
do
    expect -c "
    spawn /usr/bin/scp -rvpv -c blowfish /oracle/test/ oragsd@$HOST:/oracle/
    expect {
    "*password:*" { send $PASSWORD\r;interact }
    }
    exit
    "
done