عول

وَإِنۡ خِفۡتُمۡ أَلَّا تُقۡسِطُواْ فِي ٱلۡيَتَٰمَىٰ فَٱنكِحُواْ مَا طَابَ لَكُم مِّنَ ٱلنِّسَآءِ مَثۡنَىٰ وَثُلَٰثَ وَرُبَٰعَۖ فَإِنۡ خِفۡتُمۡ أَلَّا تَعۡدِلُواْ فَوَٰحِدَةً أَوۡ مَا مَلَكَتۡ أَيۡمَٰنُكُمۡۚ ذَٰلِكَ أَدۡنَىٰٓ أَلَّا تَعُولُواْ

If you fear you cannot act fairly towards the orphans—then marry the women you like—two, or three, or four. But if you fear you will not be fair, then one, or what you already have. That makes it more likely that you avoid bias