(regarding) the Verse: 'And if you fear that you shall not be able to deal justly with the orphans...' (4.3) It is about the orphan girl who is in the custody of a man who is her guardian, and he intends to marry her because of her wealth, but he treats her badly and does not manage her property fairly and honestly. Such a man should marry women of his liking other than her, two or three or four. 'Prohibited to you (for marriage) are: ...your foster-mothers (who suckled you).' (4.23) Marriage is prohibited between persons having a foster suckling relationship corresponding to a blood relationship which renders marriage unlawful.  

قَالَتِ الْيَتِيمَةُ تَكُونُ عِنْدَ الرَّجُلِ وَهْوَ وَلِيُّهَا فَيَتَزَوَّجُهَا عَلَى مَالِهَا وَيُسِيءُ صُحْبَتَهَا وَلاَ يَعْدِلُ فِي مَالِهَا فَلْيَتَزَوَّجْ مَا طَابَ لَهُ مِنَ النِّسَاءِ سِوَاهَا مَثْنَى وَثُلاَثَ وَرُبَاعَ