“It is an obligation upon the guardian of a woman to fear Allah with respect to who he marries her to. He must look at the prospective husband and see if he is compatible and qualified for her or not. He is marrying her to someone for her benefit, and not for his own benefit.
He cannot marry her to someone who is deficient so that guardian himself may attain some other benefit. For example, the guardian himself may wish to marry someone whom the prospective groom is a guardian for and hence he marries the woman to that man so he can himself marry the other woman.
This is a type of marriage known as ash-shigaar and the Prophet (sallallaahu alayhi wa sallam) prohibited this type of marriage. Or he may marry her to a man simply to have some alliance with his people or for some evil purpose. Or he may marry her to a man who will give him some wealth in exchange even though other men who are more appropriate for her have proposed to her.”
[Majmoo Fataawaa, 32/40]