Looking for a passage about God forbidding that a census be taken

Years ago, reading the Bible, I came across a passage where God **forbade** that a census be taken. I don't remember where that was, but would like to find it again. Looking at an online concordance, I found plenty of references where God **commanded** a census be taken, mostly for compiling a list of military age males (who could then be called upon to form an army). But none forbidding a census.