It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Sometimes the month is such, such, and such," and the third time the Prophet (peace and blessings be upon him) folded his thumb, "and sometimes it is such, such, and such," meaning a complete thirty days.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "Seek the Night of Qadr in the last ten nights; if you are unable or weak, then do not let the last seven nights overpower you."

Thabit Banani, may Allah have mercy on him, says that once I asked Sayyiduna Ibn Umar, may Allah be pleased with them both, whether the use of nabidh (fermented drink) in earthen pots was prohibited. He replied: "That is what they say." I asked, "Who says this?" He replied: "That is what they say." I asked the same question again, and he gave the same answer. Allah saved me from him that day, because when someone would ask him, "Did you really hear this from the Prophet (peace and blessings be upon him)?" he would become angry and turn his attention to that person.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sells a tree in which date palms have been pollinated, its fruit will belong to the seller, unless the buyer stipulates at the time of purchase (that he is buying the tree along with its fruit)."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "When any one of you comes for Jumu'ah, he should come after performing ghusl (ritual bath)."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) divorced his wife while she was in her "days" (menstruation). Sayyiduna Umar Farooq (may Allah be pleased with him) mentioned this to the Prophet (peace and blessings be upon him), so he said: "Tell him to take his wife back, and when she becomes 'pure', then in those days of purity he may divorce her." I asked Sayyiduna Ibn Umar (may Allah be pleased with them both), "Was that divorce counted?" He replied: "Then what else?"

Anas bin Sirin, may Allah have mercy on him, says that I once asked Sayyiduna Ibn Umar, may Allah be pleased with them both, which surahs should I recite in the Sunnah of Fajr? He replied that the Prophet, peace and blessings be upon him, used to pray the night prayer in sets of two rak'ahs. I said, I am asking you about the Sunnah of Fajr. He said: You are a man of thick intellect, do you not see that I am just beginning to speak? The Prophet, peace and blessings be upon him, used to pray the night prayer in sets of two rak'ahs, and when he feared the approach of true dawn, he would add one rak'ah and perform Witr, then he would lay his head down and rest, then get up and pray the Sunnah of Fajr at the time when the sound of the adhan was reaching his ears.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever sells a tree in which dates have been pollinated, its fruit will belong to the seller, unless the buyer stipulates at the time of purchase (that he is buying the tree along with its fruit). And whoever sells a wealthy slave, his property will belong to his former master, unless the buyer stipulates otherwise."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) fixed Dhu’l-Hulayfah as the miqat for the people of Madinah, Juhfah for the people of Sham, Yalamlam for the people of Yemen, Qarn for the people of Najd, and Dhat ‘Irq for the people of Iraq.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) and Sayyiduna Ibn Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "It is not lawful for a person to give a gift to someone and then ask for it back, except for a father who gives something to his son and then takes it back; he is exempted. Whoever gives a gift to someone and then asks for it back is like a dog that eats something, and when it is full, it vomits it out and then starts licking its own vomit."