English translation
2759. It was reported from Shu'bah, from Abū Al-Faiḍ, from Sulaim bin 'Āmir — a man from Himyar — who said: "There was a covenant between Mu'āwiyah and the Romans. He started to proceed towards their country, so that when the covenant came to an end, he would attack them. A man came on a horse, or a Turkish horse, saying: 'Allāhu Akbaru, Allāhu Akbar. Fulfill (the covenant) and do not be treacherous.' When they looked towards him, they saw he was 'Amr bin 'Abasah. Mu'āwiyah sent for him and questioned him. He said: 'I heard the Messenger of Allāh ﷺ saying: "Anyone who has a covenant with people, he is not to strengthen it nor loosen it, until the covenant has expired, or both parties bring it to an end." So Mu'āwiyah returned. (Ṣaḥīḥ)
