A.T. Robertson Commentary Acts 5:9

"But Peter [said] unto her, How is it that ye have agreed together to try the Spirit of the Lord? behold, the feet of them that have buried thy husband are at the door, and they shall carry thee out." — Acts 5:9 (ASV)

Ye have agreed together (συνεφωνηθη υμιν). First aorist passive indicative of συμφωνεω (to voice together, symphony), impersonal with dative; It was agreed together by you (or for you). "Your souls were allured together respecting this deceit" (Vincent).

To tempt the Spirit of the Lord (πειρασα το πνευμα κυριου). Like "Thou shalt not tempt the Lord thy God." It was close to the unpardonable sin which was attributing the manifest work of the Holy Spirit to Beelzebub.

The feet (ο ποδες). Graphic picture by Peter as he heard the steps of the young men at the door.