Ezra 9:12 ESV Therefore do not give your daughters to their sons, neither take their daughters for your sons, and never seek their peace or prosperity, that you may be strong and eat the good of the land and leave it for an inheritance to your children forever.
Never seek their peace or prosperity. Never run after the thing they call shalom, because it isn’t God’s shalom, because the only true shalom comes from a God that they do not know. Don’t call prosperity the same thing that they call prosperity. You’ve seen from the last few chapters of Ezra that money, gold, riches, whatever form wealth takes, is in the hand of God like the wind or a bird flying in the air. He can direct any amount of it in any direction He wants.
True prosperity is from God, and it is part of Himself. It isn’t in money or stuff, but in God. Just like true peace. Hundreds of years earlier, the people coveted what their neighbors had, even though their neighbors were against the Lord and all that He was and had done. The people decided that they liked the pagan definition of peace and the pagan definition of prosperity more than God’s definition, so they left Him to go find it.