It was narrated that Mu'adh bin Jabal said:
"The Messenger of Allah (ﷺ) said: 'I have been commanded to fight the people until they testify to La ilaha ill-allah (none has the right to be worshipped but Allah) and that I am the Messenger of Allah, and establish regular prayers and pay Zakat.'"
English reference: Vol. 1, Book 1, Hadith 72
Arabic reference: Book 1, Hadith 76