far be it from me to do something, but...
far be it from (one) to (do something)
It is not one's place to do or say some particular thing. The phrase is often used as an introduction before saying or doing that very thing. Far be it from me to tell you how much to work on this report, but do you really think it's thorough enough? I think we need to believe what Shirley's saying—far be it from her to lie. If they want to give me a raise for doing the same amount of work, then hey, far be it from me to deprive them of the opportunity.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
far be it from me to do something, but...(informal) used when you are just about to disagree with somebody or criticize them and you would like them to think that you do not really want to do this: Far be it from me to interfere, but don’t you think you’ve been arguing for long enough?
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