Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
malik:20-51Yaḥyá > Mālik > ʿAbd al-Raḥman b. al-Qāsim from his father > ʿUmar b. al-Khaṭṭāb

Yahya related to me from Malik, from Abd ar-Rahman ibn al-Qasim, from his father, that Umar ibn al-Khattab said, "People of Makka, why is it that people arrive dishevelled while you still have oil on your hair? Go into ihram when you see the new moon."  

مالك:٢٠-٥١حَدَّثَنِي يَحْيَى عَنْ مَالِكٍ عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ عَنْ أَبِيهِ أَنَّ عُمَرَ بْنَ الْخَطَّابِ قَالَ يَا أَهْلَ مَكَّةَ مَا

شَأْنُ النَّاسِ يَأْتُونَ شُعْثًا وَأَنْتُمْ مُدَّهِنُونَ أَهِلُّوا إِذَا رَأَيْتُمُ الْهِلاَلَ