The Book of Sacrifices
كتاب الأضاحى
Read the English translation first, with the original Arabic directly underneath.
When the first ten days of Dhul-Hijjah begin, it is forbidden for the one who wants to offer a sacrifice to remove anything from his hair, nails or skin
Al-Bara' b. 'Azib reported that his maternal'uncle Abu Burda b. Niyar sacrificed his animal earlier than the Prophet (ﷺ) had sacrificed. Thereupon he said:
Messenger of Allah, it is the day of meat and it is not desirable (to have longing for it and not to make use of it immediately), so I hastened in offering my animal as a sacrifice, so that I might feed my family and neighbours and my kith and kin. Thereupon Allah's Messenger (ﷺ) said: Offer again your sacrifice. He said: Messenger of Allah, I have a small milch goat of less than one year, and that is better than two dry goats (from which only) meat (can be acquired). Thereupon he said: That is better than the two animals of sacrifice on your behalf, and the sacrifice of a goat, of less than six months shall not be accepted as a sacrifice on behalf of anyone after your (sacrifice).
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ دَاوُدَ، عَنِ الشَّعْبِيِّ، عَنِ الْبَرَاءِ بْنِ عَازِبٍ، أَنَّ خَالَهُ أَبَا بُرْدَةَ بْنَ نِيَارٍ، ذَبَحَ قَبْلَ أَنْ يَذْبَحَ النَّبِيُّ، صلى الله عليه وسلم فَقَالَ يَا رَسُولَ اللَّهِ إِنَّ هَذَا يَوْمٌ اللَّحْمُ فِيهِ مَكْرُوهٌ وَإِنِّي عَجَّلْتُ نَسِيكَتِي لأُطْعِمَ أَهْلِي وَجِيرَانِي وَأَهْلَ دَارِي . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَعِدْ نُسُكًا " . فَقَالَ يَا رَسُولَ اللَّهِ إِنَّ عِنْدِي عَنَاقَ لَبَنٍ هِيَ خَيْرٌ مِنْ شَاتَىْ لَحْمٍ . فَقَالَ " هِيَ خَيْرُ نَسِيكَتَيْكَ وَلاَ تَجْزِي جَذَعَةٌ عَنْ أَحَدٍ بَعْدَكَ " .