With accent marks:
Когда́ я ем, я глух и нем.
When I eat I am deaf and mute.
This Russian saying is well known to all Russian kids. Parents tell this to their children so they don't get distracted when eating and focus on finishing food first.
To be noted, some creative kids (or adults) came up with the opposite version of this saying: когда я кушаю, я говорю и слушаю.
Other Russian proverbs
Don't go to the woods if afraid of wolves.
If you are chasing two hares at once, you won’t catch a single one.
One in the field is not a warrior.
Strike the iron while it's hot.
Without labor, you can not even catch a fish in the pond.
Start taking care of the dress while it's new, and of your honor while you are young.
What you will sow, that you will reap.
A bad example is contagious.