Obligatory Charity Tax (Zakat)

Bukhari :: Book 2 :: Volume 24 :: Hadith 529

Narrated Ibn Abbas :

I am a witness that Allah's Apostle offered the Id prayer before delivering the sermon and then he thought that the women would not be able to hear him (because of the distance), so he went to them along with Bilal who was spreading his garment. The Prophet advised and ordered them to give in charity. So the women started giving their ornaments (in charity). (The sub-narrator Aiyub pointed towards his ears and neck meaning that they gave ornaments from those places such as ear-rings and necklaces.)