March 12, 1 Samuel 15:1-9
To understand what's happening here one must also refer to Exodus 17 and Deuteronomy 25, a great example of why it's so important to study the whole word of God. The Amalekites cause Israel problems while they wandered the wilderness. Often lying in wait and attacking those who followed at the tail end of the column, the weak and slow unable to defend themselves. God promised that He would wipe out Amalek, now it's been 400 years and He tells Saul to go do it.
God is patient, something that we don't get, some day there will always be a reckoning for our sins, it may take time but it will come. Yet Saul again was not obedient in what God said to do and he kept the best stuff for himself instead of destroying it as commanded.