1 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
13:13And 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.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.