Sermon 135 About the sincerity of his own intention and support of the oppressed
Your allegiance to me was not without thinking,(1) nor is my and your position the same. I seek you for Allah's sake but you seek me for your own benefits. O' people! support me despite your heart's desires. By Allah, I will take revenge for the oppressed from the oppressor and will put a string in the nose of the oppressor and drag him to the spring of truthfulness even though he may grudge it.
(1). Here Amir almu'minin points to the view of `Umar ibn al-Khattab which he had on the allegiance of Abu Bakr on the day of Saqifah when he said: " . . . let me clarify this to you that the allegiance with Abu Bakr was a mistake and without thinking (faltah) but Allah saved us from its evil. Therefore, whoever (intends to) acts like this you must kill him. . ." (as-Sahih, al-Bukhari, vol. 8, p. 211; as-Sirah an-Nabawiyyah, Ibn Hisham, vol. 4, pp. 308309; at-Tarikh, at-Tabari, vol. l, p. l822; al-Kamil, Ibn al-Athir, vol. 2, p. 327; at-Tarikh, Ibn Kathir, vol. 5, pp. 245246; al-Musnad, Ahmad ibn Hanbal, vol. l, p. 55; as-Sirah al-Halabiyyah, vol. 3, pp. 388, 392; al-Ansab, al-Baladhuri, vol. 5, p. l5; at-Tamhid, al-Baqilani, p. l96; ash-Sharh, Ibn Abi'l-Hadid, vol. 2, p. 23)