The Ways of Ascent - 70:24
A known portion (zakat) has been set aside in their money,
Known share:
The Cow/2:219
"They ask you about intoxicants and gambling: Say: "There is a great sin in both of them and benefits for mankind, but their sin is greater than their benefit."They also ask you what they should give in charity: Say, "The surplus."This is how Allah explains His verses so that you may reflect"