وَاِنْ خِفْتُمْ اَلَّا تُقْسِطُوْا فِى الْيَتٰمٰى فَانْكِحُوْا مَا طَابَ لَكُمْ مِّنَ النِّسَاۤءِ مَثْنٰى وَثُلٰثَ وَرُبٰعَ ۚ فَاِنْ خِفْتُمْ اَلَّا تَعْدِلُوْا فَوَاحِدَةً اَوْ مَا مَلَكَتْ اَيْمَانُكُمْ ۗ ذٰلِكَ اَدْنٰٓى اَلَّا تَعُوْلُوْاۗ.

If you fear you might fail to give orphan women their due rights if you were to marry them, then marry other women of your choice two, three, or four. But if you are afraid you will fail to maintain justice, then content yourselves with one or those bondwomen in your possession. This way you are less likely to commit injustice.

[Q.S An-Nisa' : 3]