Copy file from one ec2 instance to other

suppose you want to transfer file from the second instance(ec2-2) to first instance(ec2-1), the command should be run in ec2-1 is:

scp -i /Path-To-Key-File-for-ec2-2/key.pem ec2-user@Elastic-IP-of-ec2-2:/path/filename your/local-path-on-ec2-1/filename