He sendeth forth his commandment upon earth: his word runneth very swiftly.
He sendeth forth his commandment (upon) earth: his word runneth very swiftly. God's Word is a servant which He sends forth upon earth to execute His will. It carries into effect His decree with instantaneous swiftness. So the centurion, by faith, attributed the same efficacy to Jesus' word. According to his faith so it was done unto him (Matthew 8:9; Matthew 8:13; Psalms 107:20; Job 37:12).