[dosugxxx]

sister

I think you mean the verse "Li ma taqooluna ma la taf'aloon" ie "Why do you say that which you do not do"

However my teacher had told me the verse did not have to do with preaching what one doesn't follow. Rather it means saying you did something when you really had not done it.

eg I say I fasted this week when I had actually not fasted at all.