I just watched "Fiddler on the Roof" and noticed Tevye said the following:
Who says he isn't? It's just that he's a different kind of man. As the Good Book says, "Each shall seek his own kind." In other words, a bird may love a fish, but where would they build a home together?
Presumably by "the Good Book" he meant the Tanakh however I am unable to find anything that resembles this quote in the Tanakh.
The two closest things that I was able to find were from the Book of Sirach
15 All living creatures love what is like them, and all people their neighbors. 16 All beings gather together with their own kind, and people cling to those who are like them. 17 What does a wolf have in common with a lamb? So sinners have nothing in common with the godly. 18 What peace is there between a hyena and a dog? And what peace is there between the rich and the poor? 19 Wild asses in the desert are prey for lions; so the poor are feeding grounds for the rich.
9 Birds will nest with their own kind, and truth comes back to those who practice it. 10 A lion lies in wait for prey just as sin lies in wait for those who practice injustice.
However, I know that the Book of Sirach is not in the Jewish canon of the Tanakh so why would Tevye refer to it as "the Good Book"? That does not seem to really make sense.