A Friend in need is A Friend indeed
From Poland, Greece and Bulgaria
This proverb has been studied by Turkish pupils in order to understand the other cultures and their proverbs. The work shows us lots of proverbs are common in Europe.
And this one is the same in Poland , in Greece and in Bulgaria. Actually there is also similar meaning in Turkey.
"Kara gün dostu az olur."
Means; A friend at time you are in need is rare.