Al-Matalib al-'Aliyah 3901 — Mention of the killing of Umar

It is narrated from Sayyiduna Abu Rafi' (may Allah be pleased with him) that Abu Lu'lu'ah was a slave of Mughirah bin Shu'bah (may Allah be pleased with him), and he used to make millstones. Mughirah bin Shu'bah (may Allah be pleased with him) used to take four dirhams from him every day as kharaj (a share of his earnings). Once Abu Lu'lu'ah met Sayyiduna Umar (may Allah be pleased with him) and said: "O Commander of the Believers! Mughirah has placed a very heavy burden of kharaj upon me; speak to him so that he reduces it for me." Sayyiduna Umar (may Allah be pleased with him) said to him: "Fear Allah Almighty and be good to your master," while Sayyiduna Umar (may Allah be pleased with him) intended to meet Mughirah (may Allah be pleased with him) and intercede for him to lighten his burden. But the slave became angry and said: "His justice embraces all people except me." So he resolved to kill him, and he made a two-headed dagger, sharpened it well and poisoned it. Then he brought it to al-Hurmuzan and asked: "What do you think of this?" He said: "I think that whomever you strike with it, you will surely kill." Then Abu Lu'lu'ah waited for an opportunity, and he came at the time of the morning prayer until he stood behind Sayyiduna Umar (may Allah be pleased with him). It was the practice of Sayyiduna Umar (may Allah be pleased with him) that when the iqamah for the prayer was called, he would speak, saying: "Straighten your rows." So on that day too he began saying what he always used to say. Then, when he said the takbir of the prayer, Abu Lu'lu'ah stabbed him in his shoulder and in his side, and Sayyiduna Umar (may Allah be pleased with him) fell. With his dagger he also wounded thirteen more men, of whom seven died and six were injured. Sayyiduna Umar (may Allah be pleased with him) was carried and taken to his house, and agitation spread among the people until the sun was about to rise. Then Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) called out: "O people! The prayer, the prayer!" So the people turned to the prayer, and Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him) went forward and led them in prayer with the two shortest surahs of the Qur'an. When they had finished the prayer, they went towards Sayyiduna Umar (may Allah be pleased with him). He called for something to drink so that he could gauge the depth of the wound. He was given nabidh; he drank it and it came out of his wound, and the people could not tell whether it was nabidh or blood. Then he called for milk and drank it, and it too came out of the wound. The people said: "O Commander of the Believers! No harm will come to you (there is nothing to worry about)." He said: "If being killed is a harm, then I have indeed been killed." Then the people began to praise him, and he said: "Despite what you are saying, my wish was that I should leave this world with my account even, neither owing anyone nor anyone having a claim upon me, and that my companionship with the Messenger of Allah (peace and blessings be upon him) should remain safe for me." At this Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "No, by Allah! You will not leave here merely even (rather, your rank is very high)." Then he mentioned the full account. The narrator says: Sayyiduna Umar (may Allah be pleased with him) used to find comfort in the words of Ibn Abbas (may Allah be pleased with them both), so he said: "Repeat what you said." He repeated the same words to him, and he said: "Despite what you are saying, if I had gold to the extent of the earth, I would give it as a ransom to be saved from the terror of that scene of the Hereafter."
Ibn Hibban narrated it at length from Abu Ya'la, while its origin is found briefly in Sahih Bukhari and Muslim, but most of this wording is not mentioned there.