Mt 4:7 Jesus said to him, "It is written again, 'You shall not tempt the LORD your God.'"
Prior to this, Satan told the Lord Jesus these words: "If You are the Son of God, throw Yourself down. For it is written: 'He shall give His angels charge over you,' and, 'In their hands they shall bear you up, Lest you dash your foot against a stone.'"
To deliberately and intentionally put ourselves in harm's way just to see if God would fulfill His Word is tempting or testing God. The word "tempt" in the Greek carries the idea of testing or putting to test thoroughly.
To test God is to doubt His character. It is to insult and put into question His integrity and trustworthiness. It is a subtle way of saying: "God, you're not credible. I need proof. Do this and demonstrate to me your credibility."
That's sin. That's the unbelief and sinful audacity of a creator questioning the Creator!
