Exodus 7:9 - Exposition

When Pharaoh shall speak to you, saying, Shew a miracle . It is obvious that there would have been an impropriety in Moses and Aaron offering a sign to Pharaoh until he asked for one. They claimed to be ambassadors of Jehovah, and to speak in his name ( Exodus 5:1 ). Unless they were misdoubted, it was not for them to produce their credentials. Hence they worked no miracle at their former interview. Now, however, the time was come when their credentials would be demanded, and an express command was given them to exhibit the first "sign."