With accent marks:
Свя́то ме́сто пу́сто не быва́ет.
A holy place is never empty.
If a good place is empty, someone else immediately takes it.
For example, a position promising benefits and tempting prospects is rarely vacant - there are always those who want to take it.
Other Russian proverbs
Repetition is the mother of learning.
Silent means consent.
Free cheese is only in a mousetrap.
One in the field is not a warrior.
You are greeted by your clothes but bid farewell by your mind.
Water wears away a stone.
A well-fed man does not understand a starving one.
You can't command to the heart.