The Duff in Wedding Celebrations

Question :

What is the ruling on beating the Duff after the seventh day of marriage? And is it permissible to use other instruments, instead of the Duff?

Answer:

Beating the Duff on the occasion of marriage is only for the wedding night. Its time should not be prolonged to another time, because when something is permitted for an occasion, it is limited to it accordingly. The objective of using the Duff during the days of the wedding is to show rejoice and happiness on the one hand, and to announce the marriage on the other. Because announcing the wedding is something legislated. But as for continuing it, I see no justification for it.

As for using musical instruments other than the Duff, they remain upon the basic principle, which is prohibition, according to what has been authentically reported in Sahih Al-Bukhari on the authority of Abu Malik Al-Ash'ari, may Allah be pleased with him, in which it is stated that the Prophet said:
"There will be peoples among my community who will declare permissible Al-Hir, (the wearing of) Al-Harir (silk) (i.e., by men), Khamr (alcoholic beverages) and Al-Ma'azif (musical instrument).

Declaring Al-Hir permissible means the private parts, i.e., illegal sexual intercourse may Allah protect us from that! Harir (silk) and Khamr (wine) are well known and Al-Ma'azif means all musical instruments, except those whose permissibility has been reported in the Sunnah, for they are lawful. Such as the beating the Duff on the occasion of a wedding.

Source:
Ibn 'Uthaimin
Fatawa Islamiyah, Vol. 5 Pages 449-450