It’s the bad apple that spoils the barrel.

It takes two to tango.

It’s like building castles in the air.

Speak of the devil.

Don’t bite off more than you can chew.

A drop in the bucket.

As ye sow, so shall ye reap.

To lock the barn door after horse is gone.

It’s water over the dam.

Where there’s smoke, there’s fire.

Like comparing apples and oranges

On pins and needles.

Picky, picky, picky.

The truth will out.