Genesis 6:13
יג) וַיֹּאמֶר אֱלֹקִים לְנֹחַ קֵץ כָּל בָּשָׂר בָּא לְפָנַי כִּי מָלְאָה הָאָרֶץ חָמָס מִפְּנֵיהֶם וְהִנְנִי מַשְׁחִיתָם אֶת הָאָרֶץ:
And God said to Noah, "The end of all flesh has come before Me, for the earth has become full of robbery because of them, and behold I am destroying them from the earth." [translation by Judaica Press]

Suggested Discussion Questions:

Why did G-d choose to destroy the earth?

Why did G-d choose to destroy the earth via a flood?

Time Period: Biblical (early ancestors to 165 BCE)