How do we know that God protects His people from Satan?

In the Bible, we see that Satan cannot act freely against God's chosen people without divine permission. In the account of Job, Satan approaches God to seek permission to afflict Job (Job 1:6-12), demonstrating that he is ultimately under God's authority. Similarly, in Luke 22:31-32, the Lord tells Peter, 'Satan has desired to have you,' but assures him that He has prayed for him so that his faith would not fail. This indicates that while Satan's desires to attack may be real, God's sovereign control ensures that any test or trial serves a greater purpose in refining and strengthening faith. Thus, believers can trust in God's protective sovereignty against the schemes of the enemy.