American Standard Version (ASV):
Then Saul said to David, Blessed be thou, my son David: thou shalt both do mightily, and shalt surely prevail. So David went his way, and Saul returned to his place.
King James Version (KJV):
Then Saul said to David, Blessed [be] thou, my son David: thou shalt both do great [things], and also shalt still prevail. So David went on his way, and Saul returned to his place.