Whenever Ibn Umar intended to set out for Makkah, he would apply oil that had no fragrance, then come to the mosque of Dhul-Hulayfah and pray. He would then mount his camel, and once it stood upright with him on it, he would enter the state of ihram. He said, "This is how I saw the Prophet ﷺ do it."
كان ابن عمر رضي الله عنهما إذا أراد الخروج إلى مكة ادهن بدهن ليس له رائحة طيبة، ثم يأتي مسجد ذي الحليفة فيصلي، ثم يركب وإذا استوت به راحلته قائمة أحرم ثم قال: هكذا رأيت النبي ﷺ فعل.
Bukhari narrated it in the Book of Hajj (1554), from Sulayman bin Dawud Abu Rabi, who said, "Fulayh narrated to us, from Nafi," with the same wording.As for what is narrated from Abdullah bin Umar, from the Prophet ﷺ, "that he applied oil that was not scented while he was in ihram," this is daif. Tirmidhi (962), Ibn Majah (3083), Imam Ahmad (4782), and Ibn Khuzayma (2652) all narrated it through Hammad bin Salama, from Farqad Sabakhi, from Saeed bin Jubayr, from Ibn Umar, who related it.Muqattat means "scented." Tirmidhi said so, and he said, "This is a rare hadith that we know only through the hadith of Farqad Sabakhi from Saeed bin Jubayr. Yahya bin Saeed criticized Farqad Sabakhi, though people did narrate from him." I say, it is as he said, for more than one scholar criticized him.Ibn Khuzayma said, "I fear that Farqad Sabakhi erred in attributing this report to the Prophet, for Thawri narrated from Mansur, from Saeed bin Jubayr, who said, 'Ibn Umar used to apply oil when he intended to enter ihram.'" Bukhari narrated it through this route in the Book of Hajj (1537), as did Ibn Khuzayma in his Sahih (2653), and he said, "Mansur bin Mutamir has a better memory, greater knowledge of hadith, and is more precise than a number of men equal to Farqad Sabakhi. Hajjaj bin Minhal narrated it likewise, from Hammad." End of quote.Then he said, "Waki bin Jarra narrated it from Hammad bin Salama and said, 'at ihram.' Haytham bin Jameel narrated it from Hammad and said, 'when he intended to enter ihram.'" Ibn Khuzayma responded to this, saying, "The wording mentioned by Waki and the wording mentioned by Haytham bin Jameel would imply that even if the oil were scented with the finest perfume, applying it would still be permissible when one intends to enter ihram, since the Prophet ﷺ perfumed himself when he intended to enter ihram with a perfume containing musk, and musk is the finest of perfumes, as the Chosen One ﷺ himself reported."In Sahih Bukhari (1537), from Saeed bin Jubayr, who said, "Ibn Umar used to apply oil." I mentioned this to Ibrahim, and he said, "What will you do with his statement, 'Aswad narrated to me, from Ayesha, who said, "It is as if I can see the gleam of perfume in the parting of the hair of the Messenger of Allah ﷺ while he was in ihram"'?"The conclusion is that the hadith of Ibn Umar is properly attributed only to him and not to the Prophet, because the students of Hammad bin Salama differed about it. Farqad Sabakhi mistakenly raised it to the Prophet, while others kept it attributed only to Ibn Umar.Umar bin Khattab disliked continuing to wear perfume after entering ihram, and his son Abdullah followed him in that, while Ayesha used to object to him over it. Saeed bin Mansur narrated, through the route of Abdullah bin Abdullah bin Umar, that Ayesha used to say, "There is no harm in touching perfume at the time of ihram." He said, "So I called a man while I was sitting beside Ibn Umar and sent him to her. I already knew her statement, but I wanted my father to hear it. My messenger came back to me and said, 'Ayesha says there is no harm in perfume at the time of ihram, so use whatever you wish.'" He said, so Ibn Umar fell silent.Likewise, Salim bin Abdullah bin Umar used to disagree with his father and grandfather on this matter, because of the hadith of Ayesha. Ibn Uyayna said, "Amr bin Dinar informed us, from Salim, that he mentioned the statement of Umar concerning perfume, then said, 'Ayesha said...'" and he related the hadith. Salim said, "The sunnah of the Messenger of Allah ﷺ is more deserving of being followed." Hafiz mentioned this in Fath al-Bari.