Waki' bin al-Jarrah وكيع بن الجراح · The Book on Faith

said: "When the Messenger of Allah (ﷺ) died and Abu Bakr became the Khalifah after him, whoever disbelieved from the Arabs disbelieved, so Umar bin Al-Khattab said to Abu Bakr: 'How will you fight the people while the Messenger of Allah has said: 'I have been ordered to fight the people until they say La Ilaha Illallah, and if they say that, then their blood and wealth will be protected from me, except what it makes obligatory upon them, and…

that the Messenger of Allah (ﷺ) said: "The covenant between us and them is the Salat, so whoever abandons it he has committed disbelief."

that the Messenger of Allah (ﷺ) said: "Whenever a man makes a promise and he intends to fulfill it, but he does not fulfill it, then there is no burden upon him."