Bismihi ta'ala

In an Islamic marriage contract, it is necessary to stipulate a nuptial gift, or what we call sidāq or mahr, and it can be anything that has a value, like teaching to recite Quran, or a copy of a Quran, etc. 

There are many benefits of having such a mahr and not demanding high mahr. There is a statement from the holy Prophet (s.a.w.) that says the best of the women of my ummah is she with the less mahr.

Mahr is not a sign of love, or a security bond, but only a gesture and token of truthfullness, and anything spiritual will of course carry many benefits in this dunya and in akhirah.

With prayers for your success.