Abdul Malik bin Aby عبد الملك بن أبي سليمان · The Book on Military Expeditions

From his father, from his grandfather, that the Messenger of Allah (ﷺ) said during his Khutbah: "Fulfill the allegiances sworn in Jahiliyyah for it" - meaning Islam - "does not add to them except in gravity. And do not initiate new allegiances in Islam." There are narration on this topic from 'Abdur-Rahman bin 'Awf, Umm Salamah, Jubair bin Mut'im, Abu Hurairah, Ibn 'Abbas, and Qais bin 'Asim. This Hadith is Hasan Sahih.