The Prophet (ﷺ) sent Mu'adh to Yemen.

When the Prophet (ﷺ) sent Mu`adh to Yemen, he said to him, "You are going to a nation from the people of the Scripture, so let the first thing to which you will invite them, be the Tauhid of Allah. If they learn that, tell them that Allah has enjoined on them, five prayers to be offered in one day and one night. And if they pray, tell them that Allah has enjoined on them Zakat of their properties and it is to be taken from the rich among them and given to the poor. And if they agree to that, then take from them Zakat but avoid the best property of the people."

The Prophet (ﷺ) said, "O Mu`adh! Do you know what Allah's Right upon His slaves is?" I said, "Allah and His Apostle know best." The Prophet (ﷺ) said, "To worship Him (Allah) Alone and to join none in worship with Him (Allah). Do you know what their right upon Him is?" I replied, "Allah and His Apostle know best." The Prophet (ﷺ) said, "Not to punish them (if they do so).

A man heard another man reciting (in the prayers): 'Say (O Muhammad): "He is Allah, the One." (112:1) And he recited it repeatedly. When it was morning, he went to the Prophet (ﷺ) and informed him about that as if he considered that the recitation of that Sura by itself was not enough. Allah's Messenger (ﷺ) said, "By Him in Whose Hand my life is, it is equal to one-third of the Qur'an."

The Prophet (ﷺ) sent (an army unit) under the command of a man who used to lead his companions in the prayers and would finish his recitation with (the Sura 112): 'Say (O Muhammad): "He is Allah, the One." ' (112:1) When they returned (from the battle), they mentioned that to the Prophet. He said (to them), "Ask him why he does so." They asked him and he said, "I do so because it mentions the qualities of the Beneficent and I love to recite it (in my prayer)." The Prophet; said (to them), "Tell him that Allah loves him."

Allah's Messenger (ﷺ) said, "Allah will not be merciful to those who are not merciful to mankind."

We were with the Prophet (ﷺ) when suddenly there came to him a messenger from one of his daughters who was asking him to come and see her son who was dying. The Prophet (ﷺ) said (to the messenger), "Go back and tell her that whatever Allah takes is His, and whatever He gives is His, and everything with Him has a limited fixed term (in this world). So order her to be patient and hope for Allah's reward." But she sent the messenger to the Prophet (ﷺ) again, swearing that he should come to her. So the Prophet got up, and so did Sa`d bin 'Ubada and Mu`adh bin Jabal (and went to her). When the child was brought to the Prophet (ﷺ) his breath was disturbed in his chest as if it were in a water skin. On that the eyes of the Prophet (ﷺ) became flooded with tears, whereupon Sa`d said to him, "O Allah's Messenger (ﷺ)! What is this?" The Prophet (ﷺ) said, "This is mercy which Allah has put in the heart of His slaves, and Allah bestows His mercy only on those of His slaves who are merciful (to others)."

The Prophet (ﷺ) said, "None is more patient than Allah against the harmful and annoying words He hears (from the people): They ascribe children to Him, yet He bestows upon them health and provision .

The Prophet (ﷺ) said, "The keys of the unseen are five and none knows them but Allah: (1) None knows (the sex) what is in the womb, but Allah: (2) None knows what will happen tomorrow, but Allah; (3) None knows when it will rain, but Allah; (4) None knows where he will die, but Allah (knows that); (5) and none knows when the Hour will be established, but Allah."

`Aisha said, "If anyone tells you that Muhammad has seen his Lord, he is a liar, for Allah says: 'No vision can grasp Him.' (6:103) And if anyone tells you that Muhammad has seen the Unseen, he is a liar, for Allah says: "None has the knowledge of the Unseen but Allah."