The Prophet ﷺ said, "The Throne shook at the death of Saad bin Muaz."
حدثنا يحيى حدثنا عوف قال حدثني أبو نضرة قال سمعت
عن النبي ﷺ اهتز العرش لموت سعد بن معاذ
Its isnad is sahih. "Awn" is a mistake for "Awf," as in H and as will come later, and he is Awf bin Abu Jameela Arabi, trustworthy. The hadith with similar wording is found in Bukhari 44/5 in the Book of Merits, Merits of Saad, Muslim 1915/4 no. 2466 in the Book of Virtues, Virtues of Saad, Ibn Majah 56/1 no. 158, and Tirmidhi 689/4 no. 3848, who said, hasan sahih.