Praise be to Allaah.
Writing down the contracts and agreements that people make among
themselves is a way of confirming and formalizing them, but it is not a condition for the
validity of the contract. The marriage contract may be made verbally by means of an offer
on the part of the bride’s wali or guardian (e.g. “I marry my daughter to
you”) and acceptance on the part of the groom (e.g. “I accept”). Writing it
down is not a condition, but it does serve to document and confirm the contract, which is
a good thing, especially nowadays. And Allaah is the source of help.