Hadith 8:85
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] .
وعن ابن عمر رضي الله عنهما قال: قال رسول الله صلى الله عليه وسلم: " بني الإسلام على خمس: شهادة أن لا إله إلا الله وأن محمدًا رسول الله، وإقام الصلاة، وإيتاء الزكاة، وحج البيت، وصوم رمضان" ((متفق عليه)).