Is it permissible to make the husband's memorization of the Noble Qur'an a dowry in marriage, given the dispute regarding the validity of Umm Sulaym's dowry?

The majority of scholars hold that the mahr (dowry) must be money or a benefit for which a wage can be taken, such as teaching a permissible branch of knowledge, based on the Almighty's saying: "And lawful for you are all beyond those, that you seek them with your wealth." (Quran 4:24). The majority also permitted benefits to be a mahr if compensation could be taken for them.

Accordingly, the four imams are of the view that a man's memorization of the Quran is not suitable as a mahr, because it is not a quantifiable benefit. However, teaching her parts of the Quran can be a mahr, because it is an effort expended with value.

As for the story of Umm Sulaym's marriage to Abu Talhah and making his conversion to Islam her mahr, two answers have been given regarding it: 1. That this was an exaltation of Islam, and his conversion was not a real mahr; rather, the marriage was contingent upon it, and the original mahr was passed over in silence. 2. That this marriage took place before the revelation of the verses obligating the mahr, as Abu Talhah was among the first of the Ansar to embrace Islam.

To ensure the validity of the mahr, a specific amount of money should be agreed upon, even if small, and then it can be stipulated that the husband memorize parts of the Quran.