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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
muslim:1977d – Isḥāq b. Ibrāhīm > Sufyān > ʿAbd al-Raḥman b. Ḥumayd b. ʿAbd al-Raḥman b. ʿAwf > Saʿīd b. al-Musayyab > Um Salamah Tarfaʿuh

If anyone of you intends to offer sacrifice he should not get his hair cut or nails trimmed.  

مسلم:١٩٧٧d – وَحَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ أَخْبَرَنَا سُفْيَانُ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ حُمَيْدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ عَنْ أُمِّ سَلَمَةَ تَرْفَعُهُ قَالَ

إِذَا دَخَلَ الْعَشْرُ وَعِنْدَهُ أُضْحِيَّةٌ يُرِيدُ أَنْ يُضَحِّيَ فَلاَ يَأْخُذَنَّ شَعْرًا وَلاَ يَقْلِمَنَّ ظُفُرًا