Praise be to Allah.
It is permissible for you to co-operate with him on the matter, so long as you do your best to be certain of the information that you are giving to him, and you avoid lying or cheating, because if this is done truthfully and sincerely, it is counted as cooperating in righteousness and piety, and as offering sincere advice to a brother (naseehah). May Allaah help us all.
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