I want you to swear by the Lord, the God of heaven and the God of earth, that you will not get a wife for my son from the daughters of the Canaanites, among whom I am living, but will go to my country and my own relatives and get a wife for my son Isaac.” (Genesis 24) We know that Abraham's concern for the ethnicity of Isaac's future wife was devoid of any religious component because he had fled his old clan to escape their idolatrous ways.Abraham had his servant vow to find Isaac an idolatrous but ethnically similar wife.
We know the land of Midian, in which Moses met Zipporah, is in Arabia.
 The most likely scenario, then, is that the Cushite women of Numbers 12 is really the Midianite Zipporah.
As part of this repentance they pledged to end their interracial marriages according to God's will: “We have been unfaithful to our God by marrying foreign women from the peoples around us.
But in spite of this, there is still hope for Israel. We will support you, so take courage and do it.” (Ezra 10) “Moreover, in those days I saw men of Judah who had married women from Ashdod, Ammon and Moab. I made them take an oath in God’s name and said: ‘You are not to give your daughters in marriage to their sons, nor are you to take their daughters in marriage for your sons or for yourselves.’” Other prohibitions against interracial marriage can be found in Exodus -16, Joshua , and Deuteronomy 7:3: “Do not intermarry with them.
Now let us make a covenant before our God to send away all these women and their children, in accordance with the counsel of my lord and of those who fear the commands of our God. Half of their children spoke the language of Ashdod or the language of one of the other peoples, and did not know how to speak the language of Judah. Do not give your daughters to their sons or take their daughters for your sons.” Some have claimed the Bible's ban on interracial marriage was based on religion rather than ethnicity, and that the sole purpose of the prohibition was to keep the people pure of idolatrous influence.
This certainly cannot be true in the book of Ezra, where the people put away their ethnically different wives and children. Would God have Christians encouraging risky marriages?Does God want Christians to foolishly enter unstable marriages and risk the breakup of their families just to fight racism?God appears to have agreed with Isaac's ethnocentric view because he chose Jacob (the younger son) to be the father of his people over the elder son Esau who had corrupted Abraham's line by marrying outside his ethnic group. Supporters of interracial marriage often seek examples from the Bible.The most common of these is Moses' alleged Afroethnic wife in Numbers 12: “Miriam and Aaron began to talk against Moses because of his Cushite wife, for he had married a Cushite.” The problem with interpreting this passage as an interracial marriage is that supporters of this view make two huge unlikely assumptions. This shared name resulted from a Semitic Arabian kingdom conquering the region of Africa below Egypt.