An-Nisa 4:3 وان خفتم الا تقسطوا في اليتامى فانكحوا ما طاب لكم من النساء مثنى وثلاث ورباع فان خفتم الا تعدلوا فواحدة او ما ملكت ايمانكم ذالك ادنى الا تعولوا ٣

And if you fear that you will not deal justly with the orphan girls, then marry those that please you of [other] women, two or three or four. But if you fear that you will not be just, then [marry only] one or those your right hands possess [i.e., slaves]. That is more suitable that you may not incline [to injustice].

If you fear that you will not deal fairly with orphan girls, you may marry whichever [other] women seem good to you, two, three, or four. If you fear that you cannot be equitable [to them], then marry only one, or your slave(s): that is more likely to make you avoid bias.