The Prophet (peace and blessings be upon him) said: "Do not marry women for their beauty, for perhaps their beauty will ruin them; and do not marry them for their wealth, for perhaps their wealth will incite them to rebellion. Rather, marry on the basis of religion. A black slave woman with cut ears is better, if she is religious."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13469