Jami` at-Tirmidhi Book 11, Hadith 6
The Messenger of Allah said: "When someone whose religion and character you are pleased with comes to you then marry (her to) him. If you do not do so, then there will be turmoil (Fitnah) in the land and discord (Fasad). If you do not do so, then there will be turmoil (Fitnah) in the land and discord (Fasad)." They said: "O Messenger of Allah! What if there was something about him?"
He said: "When someone whose religion and character you are pleased with comes to you then marry him." (And he (pbuh) said this) three times.
The Messenger of Allah said: "When someone whose religion and character you are pleased with proposes to (someone under the care) of one of you, then marry to him. If you do not do so, then there will be turmoil (Fitnah) in the land and abounding discord (Fasad)."
The Prophet said: "Indeed the woman is married for her religion, her wealth, and her beauty, so take the one with religion, and may your hands be dusty."