(Joshua 1:7-8 NIV) Be strong and very courageous. Be careful to obey all the law my servant Moses gave you; do not turn from it to the right or to the left, that you may be successful wherever you go. {8} Do not let this Book of the Law depart from your mouth; meditate on it day and night, so that you may be careful to do everything written in it. Then you will be prosperous and successful.

Those verses were for Israel before the coming of Christ. The Jews were to follow all the dietary laws and the animal sacrificial system. That ended when Jesus died on the cross.

Actually, the Arab countries are some of the poorest countries on the planet. The rulers of the oil rich countries spending billions on themselves while the average person in those countries is illiterate and dirt poor.

Those people are poor while Israel is rich. God said to Abraham:

(Genesis 12:3 NIV) I will bless those who bless you, and whoever curses you I will curse; and all peoples on earth will be blessed through you."

Those who curse Israel today are the Muslim countries. They are among the most brutal, corrupt, incompetent, and thieving governments on the planet.