釈迦に説法

しゃかにせっぽう

teaching your grandmother to suck eggs

Contains kanji

Example sentences

釈迦に説法とは存じますが、医者も禁煙されたほうがよろしいのではないでしょうか。

I'm sure you don't need me to tell you this, but wouldn't it be a good idea to stop smoking?