King Saul had been instructed through Samuel the prophet to wipe out the Amalekites

Samuel rose early in the morning to meet Saul; and it was told Samuel, saying, “Saul came to Carmel, and behold, he set up a monument for himself, then turned and proceeded on down to Gilgal.” ¹³ Samuel came to Saul, and Saul said to him, “Blessed are you of the Lord! I have carried out the command of the Lord.” ¹⁴ But Samuel said, “What then is this bleating of the sheep in my ears, and the lowing of the oxen which I hear?” ¹⁵ Saul said, “They have brought them from the Amalekites, for the people spared the best of the sheep and oxen, to sacrifice to the Lord your God; but the rest we have utterly destroyed.” ¹⁶ Then Samuel said to Saul, “Wait, and let me tell you what the Lord said to me last night.” And he said to him, “Speak!”

¹⁷ Samuel said, “Is it not true, though you were little in your own eyes, you were made the head of the tribes of Israel? And the Lord anointed you king over Israel, ¹⁸ and the Lord sent you on a mission, and said, ‘Go and utterly destroy the sinners, the Amalekites, and fight against them until they are exterminated.’ ¹⁹ Why then did you not obey the voice of the Lord, but rushed upon the spoil and did what was evil in the sight of the Lord?”

²⁰ Then Saul said to Samuel, “I did obey the voice of the Lord, and went on the mission on which the Lord sent me, and have brought back Agag the king of Amalek, and have utterly destroyed the Amalekites. ²¹ But the people took some of the spoil, sheep and oxen, the choicest of the things devoted to destruction, to sacrifice to the Lord your God at Gilgal.” ²² Samuel said,

“Has the Lord as much delight in burnt offerings and sacrifices as in obeying the voice of the Lord? Behold, to obey is better than sacrifice, and to heed than the fat of rams.

²³ “For rebellion is as the sin of divination, and insubordination is as iniquity and idolatry. Because you have rejected the word of the Lord, He has also rejected you from being king.” (1 Samuel 15:12-23)

In this case Saul decided to do something that was similar to God's instructions, but not the same. In his own thinking he probably thought he had done something even better than what God had commanded. He was going to sacrifice some of the Amalekite animals to God. Samuel's comments here cut right to the core of the matter. Instead of doing what he was told, Saul did his own thing; that's rebellion. When you pay attention to what you think over what someone above you has said, that's insubordination. It's also idolatry because you have worshiped yourself over God.

You may think you are doing something great for God. You may even be happy about it, and think you are doing right. Yet, if you are disobeying, what you think and feel is false.

How does God consider our attempts to innovate on the instructions he has given us?	God loves innovations on our part because he created us to think for ourselves God considers innovations as rebellion
Worship of God is about	How we feel while worshipping him What we do for him when worshipping True love in our heart that brings obedience