It Only Takes One
In his Commentary on the Acts of the Apostles, Michael Baumgarten explained the nature of Ananias and Sapphira's sin and the rationale for God's judgment on it, when he wrote:
"It is therefore nothing less than hypocrisy, that leaven of the Pharisees (Luke 12:1), which here comes across us in the community. Had this impurity found free course and play it would have corrupted the holiness of the whole body (1 Cor. 5:6). But at the very moment when the vice of hypocrisy seeks to carry out its object, and becomes manifest, it is seized and ejected.
...The nature of this crime he twice declares to be a lie (vv. 3, 4)...In the present case, besides the enormity of the lie, which even of itself leads us to look for its source in the Father of lies (John 8:44), there is the additional circumstance, that this iniquity is the first instance of evil detected within this sainted circle. Just as in Paradise, it was from none but the evil one himself that sin could have come upon Adam and his wife, so in the present case it must have been precisely the same tempter who instigated Ananias and his wife, so that at the very time that they pretend to be full of the Holy Ghost, they are discovered to be in fact full of the spirit of evil (ver. 3).
...The wonderful effects which in this case followed the judicial sentence, was intended to make it clear to all succeeding ages, that it is associated with full and sufficient power....The holiness of the community was that which essentially was revealed in the retribution upon Ananias and Sapphira. The community had in this case shown itself as it were the sacred fire of the altar, which broke forth and consumed everything impure (Leviticus 10:1—10). The community as a whole had scarcely been aware of that extent of its own holiness, which was shown in this event. On this account they themselves cannot but feel fear; not to mention the terror which must have seized those who stood without and heard of such holy rigor."