Jamieson, Fausset and Brown on Exodus 6:9-11

9-11. Moses spake so unto the children of Israel--The increased severities inflicted on the Israelites seem to have so entirely crushed their spirits, as well as irritated them, that they refused to listen to any more communications (Ex 14:12). Even the faith of Moses himself was faltering; and he would have abandoned the enterprise in despair had he not received a positive command from God to revisit the people without delay, and at the same time renew their demand on the king in a more decisive and peremptory tone.