It is forbidden to eat the slaughter of one who calls upon the dead
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Q193: The questioner asks: Is it permissible for us and our children to eat from the slaughter of a man who invited us, while he calls upon the awliya (close friends of Allah) and the righteous, and seeks nearness to them?
A193: If that is confirmed and you are certain that he calls upon the awliya and the righteous, then he is one who associates partners with Allah, and the slaughter of one who associates partners with Allah is not lawful, so do not eat from it. As for mere suspicion, the original state is safety, and praise be to Allah, you build upon the apparent.
A193: If that is confirmed and you are certain that he calls upon the awliya and the righteous, then he is one who associates partners with Allah, and the slaughter of one who associates partners with Allah is not lawful, so do not eat from it. As for mere suspicion, the original state is safety, and praise be to Allah, you build upon the apparent.
Source
www.alifta.gov.sa
The Arabic text is copied verbatim from the original source, without any edits.