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.

'TRY THE SPIRIT OF THE LORD?'-'put the Spirit of the Lord to the test' (Wey). 3985. peirazo pi-rad'-zo; from 3984; to test (objectively), i.e. endeavor, scrutinize, entice, discipline: -assay, examine, go about, prove, tempt(-er), try.

-'To put it to the proof whether the Holy Spirit, ruling in the apostles, could be deceived' (Vincent p. 468) 'thus daringly to put the Holy Ghost on trial, whether or not he is able to discern the thoughts of your evil hearts.' (P.P. Comm. p. 158) 'to see if they could get by without being challenged by the Spirit.' (Reese p. 207)

Point to Note:

If this couple had been asked, 'Can God be fooled', they probably would have said no. For they were believers. But they, like some today, do things without really thinking about what they are doing. Every time we act hypocritically, we are "trying God", i.e. we are daring Him to act.

'BEHOLD, THE FEET OF THEM THAT HAVE BURIED THY HUSBAND ARE AT THE DOOR'-possibly just returning from finishing the task of burying her husband.