Surah An-Nur, ayah 32

وَأَنكِحُواْ ٱلۡأَيَٰمَىٰ مِنكُمۡ وَٱلصَّٰلِحِينَ مِنۡ عِبَادِكُمۡ وَإِمَآئِكُمۡۚ إِن يَكُونُواْ فُقَرَآءَ يُغۡنِهِمُ ٱللَّهُ مِن فَضۡلِهِۦۗ وَٱللَّهُ وَٰسِعٌ عَلِيمٞ ٣٢

Wa ankihul-ayāmā minkum was-sālihīna min 'ibādikum wa imā'ikum in yakūnū fuqarā'a yughnihimullāhu min fadlihī wallāhu wāsi'un 'alīm

And marry the unmarried among you and the righteous among your male slaves and female slaves. If they should be poor, Allāh will enrich them from His bounty, and Allāh is all-Encompassing and Knowing.