Riyad us Saliheen: Hadith 1270

The Messenger of Allah (ﷺ) said, "(The superstructure of) Islam is based on five (pillars), testifying the fact that La ilaha illallah wa anna Muhammad-ar-Rasul-ullah

[there is no true god except Allah, and Muhammad ( (ﷺ)) is the Messenger of Allah], establishing As- Salat (the prayers), paying Zakat (poor due), the pilgrimage to the House

[of Allah (Ka'bah)], and the Saum (fasting) during the month of Ramadan."

[Al-Bukhari and Muslim].