Abu Bakr

"Stop, O people, that I may give you ten rules for your guidance in the battlefield. Do not commit treachery or deviate from the right path. You must not mutilate dead bodies. Neither kill a child, nor a woman, nor an aged man. Bring no harm to the trees, nor burn them with fire, especially those which are fruitful. Slay not any of the enemy’s flock, save for your food. You are likely to pass by people who have devoted their lives to monastic services; leave them alone."

"Whoever amongst you worshipped Muhammad, then Muhammad is dead, but whoever worshipped Allah, Allah is alive and will never die. Allah said: 'Muhammad is not but a messenger. [Other] messengers have passed on before him. So if he was to die or be killed, would you turn back on your heels [to unbelief]? And he who turns back on his heels will never harm Allah at all; but Allah will reward the grateful.' " (Quran 3.144)"

"Abu Bakr al-Siddiq said to Khalid ibn al-Walid: 'Strive for death, then you will be given life.'"واحرص على الموت توهب لك الحياة" Al-ʿIqd al-Farīd author Ibn Abd Rabbih (1/92 )"

"I have been given the authority over you, and I am not the best of you. If I do well, help me; and if I do wrong, set me right. Sincere regard for truth is loyalty and disregard for truth is treachery. The weak amongst you shall be strong with me until I have secured his rights, if God wills; and the strong amongst you shall be weak with me until I have wrested from him the rights of others, if God wills. Obey me so long as I obey God and His Messenger. But if I disobey God and His Messenger, you owe me no obedience. Arise for your prayer, God have mercy upon you."

"In the name of the most merciful God, Abdallah Athik Ibn Abi Quhafa, to the rest of the true believers; health and happiness, and the mercy and blessing of God be upon you. I praise the most high God, and I pray for his prophet Mohammed. This is to acquaint you that I intend to send the true believers into Syria, to take it out of the hands of the infidels, And I would have you know, that the fighting for religion is an act of obedience to God."

"It is a matter of great shame that the birds wake up in the morning before you."

"Give brief orders; speeches that are too long are likely to be forgotten."

"In the Name of Allah, the Most Beneficent, the Most Merciful. This is the (final) command of Abu Bakr ibn Abu Quhafah, which he writes as he is exiting this world of the Hereafter... a time during which a disbeliever comes to believe, a wicked-doer comes to have faith, and a liar tells the truth: Verily, I appoint over you Umar ibn al-Khattab as my successor, so listen to him and obey him... If he acts justly, then that is what I think of him and that is what I know about him. But if he changes for the worse (i.e., he begins to act unjustly), then for each person is that which he has earned. Goodness is what I wanted, and I do not know anything of the Unseen world. "And whose who do wrong will come to know by what overturning they will be overturned." Quran, Chapter 26, verse 227"

"How wretched are those in the sight of God who disobey Him."

"Wer auch immer Muhammad verehrte, lasst ihn wissen, dass Muhammad tot ist. Und wer Allah verehrt, lasst ihn wissen, dass Allah lebt und niemals sterben wird."