An-Nisâ’ 4:3
وَإِنْ خِفْتُمْ أَلَّا تُقْسِطُوا فِي الْيَتَامَىٰ فَانكِحُوا مَا طَابَ لَكُم مِّنَ النِّسَاءِ مَثْنَىٰ وَثُلَاثَ وَرُبَاعَ ۖ فَإِنْ خِفْتُمْ أَلَّا تَعْدِلُوا فَوَاحِدَةً أَوْ مَا مَلَكَتْ أَيْمَانُكُمْ ۚ ذَٰلِكَ أَدْنَىٰ أَلَّا تَعُولُوا ٣
Wain khiftum alla tuqsitoo fee alyatama fainkihoo ma taba lakum mina alnnisai mathna wathulatha warubaAAa fain khiftum alla taAAdiloo fawahidatan aw ma malakat aymanukum thalika adna alla taAAooloo
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And if you have the apprehension that you will not be able to treat the orphan girls justly, then marry the women you like and who are lawful for you, two or three or four (but this sanction is conditional on justice). But if you fear that you will not be able to treat (more than one wife) justly, then (marry) only one woman or the maids who have come under your possession (according to the Islamic law). This makes it more likely that you restrain yourselves from committing injustice. (4:3)