Ibn 'Umar (May Allah be pleased with them) reported:
The Messenger of Allah (ﷺ) said, "Islam is based on five (pillars): testifying that there is no true god except Allah and that Muhammad (ﷺ) is His slave and Messenger; performing of Salat (Iqamat-as-Salat); the payment of Zakat; performing Hajj (pilgrimage) to the House [of Allah (Ka'bah)]; and Saum (fasting) during the month of Ramadan."[Al-Bukhari and Muslim]. (DE)
App reference (DE): Book 9, Hadith 85 (DE)
Arabic/English book reference (DE): Book 9, Hadith 1075 (DE)