It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that once a man asked the Prophet (peace and blessings be upon him) about the issue: If a man gives his wife three divorces, and another man marries that woman, but divorces her before consummation, will she become lawful for the first husband? He replied: No, not until the second husband tastes her honey.

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) forbade (the use of) pitchers, dubba, and muzaffat, and said: "Make nabidh in water skins."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) came to Makkah Mukarramah, performed the circuits of Tawaf, prayed two rak‘ahs behind Maqam Ibrahim, then exited through the door that leads towards Safa, and performed Sa‘i between Safa and Marwah. Then he said: "This is Sunnah."

Salim (may Allah have mercy on him) says that Sayyiduna Ibn Umar (may Allah be pleased with them both) used to speak about the place of Bida’ and would say that the Prophet (peace and blessings be upon him) assumed Ihram from the mosque itself (and not from the place of Bida’ as you have made famous).

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: "If there were to be any bad omen in anything, it would be in three things: the horse, the woman, and the house."

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: "Fever is from the heat of Hell, so extinguish it with water."

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: "Jibreel kept advising me regarding the neighbor so continuously that I began to think he would make him an heir."

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 at the occasion of the Farewell Pilgrimage: "Do not become disbelievers after me, striking the necks of one another."

It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) said: "The keys to everything have been given to me except for five things." Then he recited this verse: "The knowledge of the Hour is with Allah alone. He sends down the rain, and He knows what is in the wombs. No soul knows what it will earn tomorrow, and no soul knows in which land it will die. Surely, Allah is All-Knowing, All-Aware."

Ziyad bin Jubair says that (I was with Sayyiduna Ibn Umar, may Allah be pleased with them both, in the plain of Mina), on the way he passed by a man who had made his she-camel kneel down and wanted to slaughter it. Sayyiduna Ibn Umar, may Allah be pleased with them both, said to him: "Make it stand, tie its legs, and then slaughter it. This is the Sunnah of the Prophet (peace be upon him)."