This is an idiom taken from warning. It is an expression of warning that means that one should abstain from criticizing others in order to avoid being criticized too.
Hello Reader, thanks for your visitation. I am Olufajo Olulekan, a blogger by passion, inspiring in helping people online with useful information. I usually blog on another different platform but create this blog to make people knowledgeable about English Language, Literature in English, and Literary Texts Summary and Analysis