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Surah 3. Aal-Imran
Ayah 81 - 82
81 وَإِذْ أَخَذَ ٱللَّهُ مِيثَـٰقَ ٱلنَّبِيِّـۧنَ لَمَآ ءَاتَيْتُكُم مِّن كِتَـٰبٍ وَحِكْمَةٍ ثُمَّ جَآءَكُمْ رَسُولٌ مُّصَدِّقٌ لِّمَا مَعَكُمْ لَتُؤْمِنُنَّ بِهِۦ وَلَتَنصُرُنَّهُۥ ۚ قَالَ ءَأَقْرَرْتُمْ وَأَخَذْتُمْ عَلَىٰ ذَٰلِكُمْ إِصْرِى ۖ قَالُوٓا۟ أَقْرَرْنَا ۚ قَالَ فَٱشْهَدُوا۟ وَأَنَا۠ مَعَكُم مِّنَ ٱلشَّـٰهِدِينَ
82 فَمَن تَوَلَّىٰ بَعْدَ ذَٰلِكَ فَأُو۟لَـٰٓئِكَ هُمُ ٱلْفَـٰسِقُونَ
81. And (remember) when Allah took the covenant of the Prophets, saying: "Take whatever I gave you from the Book and Hikmah, and afterwards there will come to you a Messenger confirming what is with you; you must, then, believe in him and help him.'' Allah said: "Do you agree (to it) and will you take up Isri'' They said: "We agree.'' He said: "Then bear witness; and I am with you among the witnesses.'' 82. Then whoever turns away after this, they are the rebellious.
Allah states that He took a pledge from every Prophet whom He sent from Adam until `Isa, that when Allah gives them the Book and the Hikmah, thus acquiring whatever high grades they deserve, then a Messenger came afterwards, they would believe in and support him. Even though Allah has given the Prophets the knowledge and the prophethood, this fact should not make them refrain from following and supporting the Prophet who comes after them. This is why Allah, the Most High, Most Honored, said
(And (remember) when Allah took the covenant of the Prophets, saying: "Take whatever I gave you from the Book and Hikmah.'') meaning, if I give you the Book and the Hikmah,
("and afterwards there will come to you a Messenger confirming what is with you; you must, then, believe in him and help him.'' Allah said, "Do you agree (to it) and will you take up Isri'')
Ibn `Abbas, Mujahid, Ar-Rabi`, Qatadah and As-Suddi said that `Isri' means, "My covenant.'' Muhammad bin Ishaq said that,
(Isri) means, "The responsibility of My covenant that you took,'' meaning, the ratified pledge that you gave Me.
(They said: "We agree.'' He said: "Then bear witness; and I am with you among the witnesses.'' then whoever turns away after this,'') from fulfilling this pledge and covenant, c
(they are the rebellious.) `Ali bin Abi Talib and his cousin `Abdullah bin `Abbas said, "Allah never sent a Prophet but after taking his pledge that if Muhammad were sent in his lifetime, he would believe in and support him.'' Allah commanded each Prophet to take a pledge from his nation that if Muhammad were sent in their time, they would believe in and support him. Tawus, Al-Hasan Al-Basri and Qatadah said, "Allah took the pledge from the Prophets that they would believe in each other'', and this statement does not contradict what `Ali and Ibn `Abbas stated.
Therefore, Muhammad is the Final Prophet until the Day of Resurrection. He is the greatest Imam, who if he existed in any time period, deserves to be obeyed, rather than all other Prophets. This is why Muhammad led the Prophets in prayer during the night of Isra' when they gathered in Bayt Al-Maqdis (Jerusalem). He is the intercessor on the Day of Gathering, when the Lord comes to judge between His servants. This is Al-Maqam Al-Mahmud (the praised station) ﴿refer to 17:79﴾ that only Muhammad deserves, a responsibility which the mighty Prophets and Messengers will decline to assume. However, Muhammad will carry the task of intercession, may Allah's peace and blessings be on him.