29 killed Expedition of Abdullah ibn Rawaha[2] to Khyber, took place in February 628 AD.
So he deputed Abdallah ibn Rawaha, a leader of the Banu Khazraj, and sent him with three followers to Khyber to gather intelligence on how Al-Yusayr may be taken unaware and assassinated.
[5][9] But Abdullah ibn Rawaha found the Jews to be extremely alert for this second assassination to be a success.
When they arrived, they assured Yusayr they will make him the ruler of Khyber and would treat him well, giving al-Yusayr ibn Rizam a solemn guarantee of his safety.
When they arrived at al-Qarqarat, about six miles from Khyber, al-Yusayr suspected the plans of the Muslims and changed his mind about going to meet Muhammad.
His companions set off in the morning, but he decided to stay behind and catch up with them after saying the prayer along with Allah's Messenger (peace be upon him).