Mark 3:27
No man can enter into a strong man’s house, and spoil his goods, except he will first bind the strong man; and then he will spoil his house. No man can enter into a strong man’s house, and spoil his goods, except he will first bind the strong man; and then he will spoil his house.
Jesus spoke these words during a time of incessant labor when He spent entire nights in prayer and by day was thronged by great companies so that He had no time so much as to eat. Friends felt He was wearing Himself out by this unceasing work, and some feared His reason was becoming unsettled. At the same time His brothers, feeling keenly the reproach of relation to Him, were alarmed at His bold statements and the tumult His words and works created and were indignant at His denunciation of the scribes and Pharisees. They decided He must be persuaded or constrained to cease this manner of labor, and they induced Mary to unite with them to prevail upon Him to be more prudent. The immediate occasion was the healing of a man possessed by a demon, after which the Pharisees charged that He cast out demons by Satan's power. In so doing they called His divine works the work of the devil.
The strong man is Satan, and the saying teaches that Jesus is stronger than the strong man armed. He binds Satan, casts him out, and overcomes the powers of darkness. That binding follows Christ's victory in the last fearful conflict in Gethsemane. Satan had prepared for that final trial during the three years of Christ's ministry after being conquered in the wilderness temptation. Everything was at stake for Satan there, because if he failed his hope of mastery was lost and the kingdoms of the earth would finally become Christ's.
In context the saying warns that to attribute God's holy power to Satan and to reject the evidence of Christ's works is to reject the means by which God brings people to repentance and faith. Those who did so committed the unpardonable sin. Because Jesus is stronger than the powers of darkness and able to overcome them, His presence gives believers courage and hope as they look toward the kingdom and heavenly things.