Sa'ad's Radi-Allahu 'anhu words made the Prophet Muhammad's Sallallahu ‘Alaihi Wa Sallam face brighten with satisfaction and happiness as he addressed the Muslims and said, "Rejoice, for Allāh Subhanahu Wa Ta'ala promised me one of the two parties of the enemy (either the army or the caravan). By Allāh Subhanahu Wa Ta'ala I can almost see with my own eyes where each one of the enemy will be killed."

In the Battle of Uhud, the Muslims lost control and dispersed as they were taken by surprise by the army of disbelievers. Everything was hectic, yet Sa'ad Radi-Allahu 'anhu stood there as if pinned to the ground next to the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam. He defended him courageously as a noble warrior should do.

When the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam found out the treacherous scheme, he resorted to counter plot. First, he ordered his Companions to dig a trench around Madīnah to hold back the attackers. Second, he sent Sa'ad lbn Mu'aath Radi-Allahu 'anhu and Sa'ad lbn `Ubadah Radi-Allahu 'anhu to Ka'b lbn Asad, the leader of Banī Quraidha, to learn exactly where they stood concerning the imminent war. At that time, mutual agreements and treaties were already signed between the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam and the Jews of Banī Quraidha. The two messenger of the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam met with the Jewish leader, yet to their surprise he denied the agreement by saying, "We did not sign any agreement or treaty with Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam."

It was hard for the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam to expose the people of Madīnah to such a deadly invasion and exhausting siege; therefore, the only answer was to neutralize Ghatfān so that the attacking army would lose half of its men and strength. He began to negotiate with the Ghatfān leaders so that they would forsake the Quraish in exchange for one third of Madīnah's crops. The leaders of Ghatfān accepted this agreement, and both parties were to sign it shortly.

The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam could not go any further without consulting his Companions. He valued Sa'ad Ibn Mu'aath Radi-Allahu 'anhu  and Sa'ad Ibn `Ubadah Radi-Allahu 'anhu  opinion, for they were the leaders of Madīnah and had the right to have a say in any decision that affected it.

The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam told them about his negotiations and that he had resorted to this compensation lest Madīnah and its inhabitants be exposed to this dangerous attack and horrible siege. Both Sa'ad Radi-Allahu 'anhu asked the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam, "Is it a matter of choice or is it an inspiration from Allāh Subhanahu Wa Ta'ala?" The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam answered, "It is actually a matter that I chose for you. By Allāh Subhanahu Wa Ta'ala, I only do this because I can clearly see that the Arabs joined forces to strike you as one man so I want to curb their strength." Sa'ad lbn Mu'aath Radi-Allahu 'anhu had the intuition that their fate as men and as believers was being subtly tested so he said, "O Messenger Sallallahu ‘Alaihi Wa Sallam of Allāh Subhanahu Wa Ta'ala, when we and those Jews were disbelievers and polytheists, they did not even dream of eating a date from our land unless we gave it to them out of generosity, hospitality, or for trade purposes. So how is it, after Allāh Subhanahu Wa Ta'ala has guided us to Islām and made us honoured by it and by you, that we give them our money? By Allāh Subhanahu Wa Ta'ala, we can do without this agreement, and we will give them nothing but warfare until Allāh Subhanahu Wa Ta'ala settles our dispute." The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam at once changed his mind and notified Ghatfān's leaders that his Companions rejected the proposed agreement and that he approved and supported their opinion.

A few days later Madīnah witnessed a horrible siege. It was, in fact, a siege which it brought upon itself rather than was forced upon it due to the trench that was dug as a protection and safely procedure. The Muslims were prepared for war. Sa'ad Ibn Mu'aath Radi-Allahu 'anhu marched around with his sword and spear and recited lines of poetry that mean, `I waited anxiously for the battle to start. How beautiful death seems when the time is the right time.''

In one of the rounds of war, Sa'ad's Radi-Allahu 'anhu arm was showered with the mows of one of the disbelievers, and blood gushed severely from his wounds. He received first aid assistance to stop the bleeding, then the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam ordered him carried to the Masjid where a tent was put up so that he would be near the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam while he was nursed. The Muslims carried their great hero into the Prophet Muhammad's Sallallahu ‘Alaihi Wa Sallam Masjid and Sa'ad Radi-Allahu 'anhu looked up to the sky and said, `O Allāh Subhanahu Wa Ta'ala our Lord, if the war against the Quraish is to last any longer, please do let me live a little while longer to fight against them, for I like nothing better than fighting those people who hurt Your Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam, disbelieved him, and even drove him to emigrate. But if the war has already ended, please make my wounds pave my way to martyrdom. I implore You, dear Allāh Subhanahu Wa Ta'ala, not to let me die until I avenge myself upon Banī Quraidha!"

Allāh Subhanahu Wa Ta'ala will stand by you, Sa'ad lbn Mu'aath Radi-Allahu 'anhu! For who could say such a thing in such a situation but you? Allāh Subhanahu Wa Ta'ala did fulfil his supplication. His injury caused his death a month later, but he did not die until he had taken his revenge on the Jews of Banī Quraidha. After the Quraish became desperate in their attempt to vanquish Madīnah and their soldiers were gripped by panic, they took their arms and equipment and returned to Makkah ashamed and disappointed.

The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam believed that Madīnah had been compromised by the deceit and treachery of the Jews for too long. They left the Muslims in the lurch whenever they chose, a thing that the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam could no longer accept. Therefore, he ordered his Companions to march towards Banī Quraidha, and there the Muslims besieged them for 25 days. When the Jews were certain that there was no escape from the Muslims, they pleaded with the Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam to let Sa'ad lbn Mu'aath Radi-Allahu 'anhu, their ally in pagan times, decide what would become of them.

The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam sent his Companions to bring Sa'ad Radi-Allahu 'anhu from his tent at the Masjid. He came carried on a camel and he looked so pale and sick. The Prophet Muhammad Sallallahu ‘Alaihi Wa Sallam addressed him, "Sa'ad Radi-Allahu 'anhu, decide what should be done to Banī Quraidha." Sa'ad Radi-Allahu 'anhu remembered their treachery and deceit in general and in the Battle of Al Khandaq in particular, when Madīnah had come too close to its ruin, and said, "I say kill their warriors, capture their children, and distribute their money." Thus Sa'ad Radi-Allahu 'anhu did not die until he had taken his revenge.