There isn't one single verse in the Bible that explicitly states "good and evil live in the same place." However, the Bible contains numerous verses that explore the idea that good and evil coexist in the world, in people, and even in spiritual realms. These are some related examples.
* Genesis 3 (The Fall): This chapter describes the introduction of evil into the world through the serpent's temptation and Adam and Eve's disobedience. Before this, the world was considered "good." After the Fall, good and evil became intertwined in the human experience.
* Romans 7:15-25: Paul describes the inner struggle between his desire to do good and the pull towards sin: "For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate... For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out... Wretched man that I am! Who will deliver me from this body of death?"
* Matthew 13:24-30 (The Parable of the Wheat and the Tares): Jesus tells a parable about a farmer who sows good seed (wheat), but an enemy sows weeds (tares) among the wheat. The servants want to pull up the weeds, but the farmer says to wait until the harvest, lest they uproot the wheat as well. This illustrates the idea that good and evil often grow together and are difficult to separate completely.
* James 4:4: "You adulterous people! Do you not know that friendship with the world is enmity with God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God."
* 1 John 2:15-17: "Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. For all that is in the world—the desires of the flesh and the desires of the eyes and pride of life—is not from the Father but is from the world. And the world is passing away along with its desires, but whoever does the will of God abides forever."