Satan cannot conquer the righteous and the sultan the poor.

Lend nothing to a prayerless man
Although his mouth may gasp from penury;
Because he who neglects the commands of God
Will also not care for what he may be indebted to thee.

Saadi Shirazi

http://www.poemhunter.com/poem/ch-08-on-rules-for-conduct-in-life-maxim-20/