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John Gill
Saying, the prison truly found we shut with all safety,.... Locked, barred and bolted; and the keepers standing without before the doors; both inner and outer in their proper places, diligently discharging their office: but when we had opened we found no man within; that is, none of the apostles, for there might be other prisoners in it, who were not released by this means.
Matthew Henry
In this chapter we have, I. The sin and punishment of Ananias and Sapphira, who, for lying to the Holy Ghost, were struck dead at the word of Peter, ver. 1-11. II. The flourishing state of the church, in the power that went along with the preaching of the gospel, ver. 12-16. III. The imprisonment of the apostles, and their miraculous discharge out of prison, with fresh orders to go on to preach...