This question is geared towards Pentecostals and Charismatics (although all views are welcome), can Satan understand the tongues that are spoken by a person that is speaking in tongues as uttered by the Holy Spirit?
Here is one passage that when taken literately can imply that only God can hear the spoken utterance, but it context it doesn't really hold up since the context is order of worship.
but if there is no interpreter, he must keep silent in the church; and let him speak to himself and to God. (1 Cor 14:28)
Since Satan was an angel and has been around the earth since the creation (and Babel), is it possible that he is able to understand the utterance of men and angels
If I speak with the tongues of men and of angels, but do not have love, I have become a noisy gong or a clanging cymbal. (1 Cor 13:1)
One more argument that one can make is that the "Holy Spirit" is Holy and Satan is not, therefore Satan cannot understand the Holy utterances of the Holy Spirit. But I have been unable to find biblical support for this claim.
This question popped up during a casual discussion with my Charismatic friend and I'm Pentecostal.