How to choose a good spouse

El Baqarah Chapter 2 Verse 221

And marry not idolatrous women until they believe; even a believing bond-woman is better than an idolatress, although she may highly please you. And give not believing women in marriage to idolaters until they believe; even a believing slave is better than an idolater, although he may highly please you. These call to the Fire, but Allah calls to Heaven and to forgiveness by His command. And He makes His Signs clear to the people that they may remember.