The Institutions of State in the Khilafah by Hizb ut-Tahrir

- The Messenger (PBUH) sent Zayd ibn Haritha as an amir in Mu’tah, and he appointed the amirs that were to follow him if he was martyred. .

Ibn Sa’d narrated that the Messenger of Allah (PBUH) said: .

“The amir of the people is Zayd ibn Haritha; if he was killed then the amir is Ja’far ibn Abi Talib; and if he was killed the amir is Abdullah ibn Ruwahah; and if he was killed let the Muslims choose one man from among them and make him their amir.”.

Al-Bukhari narrated that Abdullah ibn ‘Umar (ra) said: .

“The Messenger of Allah (PBUH) appointed in the expedition of Mu’tah Zayd ibn Haritha as amir…” .

Al-Bukhari narrated from the hadith of Salamah ibn Al-Akwa’: “I went to fight with Zayd; he was appointed amir over us”. Al-Bukhari and Muslim narrated that Abdullah ibn ‘Umar (ra) said: .

“The Prophet (PBUH) sent an army and appointed Usama ibn Zayd as an amir over them. Some people defamed his leadership, so the Prophet (PBUH) said: ‘If you defame his leadership you defamed the leadership of his father before. By Allah! He is worthy of leadership…’” [Bukhari, Sahih, #4250 and Muslim, Sahih, #2436]. The Sahabah used to call the army of Mu’tah the army of amirs. Muslim narrated from Ibn Buraydah, he said: “The Messenger of Allah ( PBUH) used to advise him when appointing an amir over an army or an expedition…” .

- Abu Bakr appointed Khalid as a leader in the fight against the apostates and in the battle of Al-Yarmuk. Khalifah said, “He gave Khalid ibn Al-Walid leadership over the people, and appointed upon the ansar specifically Thabit ibn Qays ibn Shammas, whilst Khalid managed all of them”. Abu Bakr gathered the armies of Al-Sham under the leadership of Khalid in Al-Yarmuk. .

Ibn Jarir said: “And he sent for him while he was in Iraq to come to Al-Sham and be the amir over the armies in it”. ‘Umar gathered the armies of Al-Sham under the leadership of Abu ‘Ubaidah, Ibn ’Asakir said: “And he was the first to name the amir of the amirs in Al-sham”.