1؎: That is, often there is enmity between two groups or two individuals; when, due to marriage (nikah), a mutual relationship is established, that enmity disappears. And sometimes, when affection is lacking, it increases through marriage. This is the reason that kinship has become of two types: one is blood kinship (nasabi qarabat), the other is kinship by cause (sababi qarabat, i.e., through marriage). And a person develops such affection for the brothers and sisters of his wife as he has for his own real brothers and sisters, or even more than that.
Explanation & Benefits
Maulana Ataullah Sajid
Benefits and Issues: ➊ If there are friendly relations between two families, then in order to maintain and strengthen them, they should establish marital ties with each other. If a man and a woman develop an inclination towards one another, then instead of establishing unlawful relations, it is better to establish a lawful relationship through marriage (nikah). However, in this, the other conditions of marriage must also be fulfilled, such as the permission of the woman's guardian (wali), the bridal due (mahr), offer and acceptance (ijab wa qubul), and the presence of witnesses, etc.
Source: Commentary on Sunan Ibn Mājah by Mawlānā ‘Atā’ullāh Sājid, Page: 1847