What is the ruling on using electrical devices to kill insects?

Question : The questioner asks: Is it permissible to use an electric device to kill mosquitoes or flies, or does this constitute torturing them with fire?

Answer : Yes. Using this is permissible. For example, a lamp is placed with electricity, and when a mosquito or something similar approaches it, it dies. There is no harm in this for two reasons. The first reason is that this is not burning, but rather electrocution. The evidence for this is that if you touched a piece of paper with this lamp, it would not burn, which indicates that this is electrocution, not burning. The second thing is that if it is not possible to drive away mosquitoes and get rid of them except by such means, then there is no harm in it. The evidence is that the Prophet (peace and blessings be upon him) burned the palm trees of Banu Nadir. The palm trees must have had birds, insects, and the like in them, but it was not possible to destroy the palm trees except by destroying this animal life with fire. So the important point is that if it is not possible to destroy them except by that means, then there is no harm.
And it came in the hadith: He burned the ant colony with fire, as if it had annoyed him. One of the ants stung him, so Allah the Exalted said, "Why not just one ant?" Meaning, why did you not just burn the one ant that came to you? So what we see is that this device by which people catch insects is permissible, yes.