Q 31: What is the textual proof that Prayer and Zakah are compulsory?
A--- Allah, the Almighty says: {But if they repent and perform Prayer, and give Zakah, then leave their way free}. (At-Taubah,5)
Allah says: {But if they repent, perform Prayer and give Zakah, then they are your brethren in religion}. (At-Taubah, 11)
Allah says: {And they were commanded not, but that they should worship Allah, and worship none but Him Alone, and perform Prayer and give Zakah}. (Al-Bayyinah, 5)
Reference: 200 FAQ On Muslims Belief - Shiekh Hafiz Ibn Ahmed Al Hakami