From Hadith of sahih muslim
Hadith No: 7 Narrated/Authority of Talha bin Ubaidullah
A person with messy hair from Najd approached the Messenger of Allah (may peace be upon him). We heard him talking, but couldn’t understand until he got closer. We found out he was asking about Islam. The Messenger of Allah (may peace be upon him) said: You should pray five times a day and night. The person asked if there were any other prayers required. The Holy Prophet said no, but you can pray voluntarily and fast during Ramadan. The person asked if there were any other obligations. The Holy Prophet said no, but you can do other things voluntarily. The Messenger of Allah also told him about Zakat. The person asked if there were any other payments required. The Holy Prophet said no, but you can pay voluntarily. The person said he wouldn’t add or subtract anything from the obligations. The Prophet said he would be successful if he stayed true to his word.