NET

13 Then Samuel said to Saul, “You have made a foolish choice! You have not obeyed the commandment that the Lord your God gave you. Had you done that, the Lord would have established your kingdom over Israel forever.

Darby

13 And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of Jehovah thy God which he commanded thee; for now would Jehovah have established thy kingdom over Israel for ever.

KJV

13 And Samuel said to Saul, Thou hast done foolishly: thou hast not kept the commandment of the LORD thy God, which he commanded thee: for now would the LORD have established thy kingdom upon Israel for ever.