Acts 5:8

8-10. She came in prepared to act out fully the part which she had agreed upon with her husband. (8) "Then Peter answered her, Tell me whether you sold the land for so much? She said, Yes; for so much. (9) Then Peter said to her, Why is it that you have agreed together to put to proof the Spirit of the Lord? Behold, the feet of them who have buried thy husband are at the door, and they shall carry thee out. (10) Then she immediately fell at his feet and expired: and the young men coming in found her dead, and carried her out, and buried her by her husband." In her case, Peter knew what was about to take place, and declared it; but there is no indication that he exerted his own will or miraculous power to cause her death. We regard her death, like that of Ananias, as a miracle wrought independent of the power lodged in the apostles.

In the question, "Why have you agreed together to put to proof the Spirit of the Lord?" Peter expresses the result of their agreement, though it may not have been what they had in view. They did put the Spirit to proof, by testing his powers. If he had failed under the test, the consequences, as we have suggested above, would have been disastrous. But now that the test applied has triumphantly vindicated the fullness of apostolic inspiration, it was not likely that such another attempt could be made.