Jami` at-Tirmidhi 2609
جامع الترمذي#2609SahihNarrated Ibn 'Umar:that the Messenger of Allah (ﷺ) said: "Islam is based upon five: the testimony of La Ilaha Illallah, and that Muhammad is the Messenger of Allah, the establishment of the Salat, giving the Zakat, fasting (the month of) Ramadan, and performing Hajj to the House
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih
In-book reference: 40:4