Ezra cites the commandments

10And now, what shall we say, our God, after this? For we have forsaken your commandments.

11which you commanded by the hand of your servants the prophets, saying, ‘The land that you are entering to possess is a land of impurity because of the impurity of the peoples of the lands, because of their abominations with which they have filled it from end to end with their uncleanness.’

12So now, do not give your daughters to their sons, and do not take their daughters for your sons. Never seek their peace or their prosperity, so that you may be strong and eat the good of the land and leave it as an inheritance to your sons forever.