Narrated 'Abdul-Malik bin 'Umair:
from the nephew of 'Abdullah bin Salam who said: "When they were after 'Uthman, 'Abdullah bin Salam came, and 'Uthman said to him: 'What did you come for?' He said: 'I came to assist you.' He said: 'Go to the people to repel their advances against me. For verily your going is better to me than your entering here.'" He said: "So 'Abdullah bin Salam went to the people and said: 'O you people! During Jahiliyyah I was named so-and-so, then the Messenger of Allah (ﷺ) named me 'Abdullah, and some Ayat from the Book of Allah were revealed about me. (The following) was revealed about me: 'A witness from among the Children of Isra'il has testified to something similar, and believed while you rejected. Verily, Allah does not guide the wrongdoing people. (46:10)" And (the following) was revealed about me: 'Sufficient as a witness between me and you is Allah, and those too who have knowledge of the Scripture. (13:43)" Allah has sheathed the sword from you and the angels are your neighbors in this city of yours, the one in which the Revelation came to your Prophet. But by Allah! (Fear) Allah regarding this man; if you kill him, then by Allah! If you kill him, then you will cause the angels to remove your goodness from you, and to raise Allah's sheathed sword against you, such that it will never be sheathed again until the Day of Resurrection.'" He said: "They said: 'Kill the Jew and kill 'Uthman.'"
English reference: Vol. 5, Book 44, Hadith 3256
Arabic reference: Book 47, Hadith 3565