كتاب الحج
15  
The Book of Pilgrimage
(64)
Chapter: It is recommended to send the sacrificial animal to the Haram for one who does not intend to go there himself; It is reommended to garland it and to make the garland, but the one who sends it does not enter a state of Ihram, and nothing is forbidden to him because of that
(64)
باب اسْتِحْبَابِ بَعْثِ الْهَدْىِ إِلَى الْحَرَمِ لِمَنْ لاَ يُرِيدُ الذَّهَابَ بِنَفْسِهِ وَاسْتِحْبَابِ تَقْلِيدِهِ وَفَتْلِ الْقَلاَئِدِ وَأَنَّ بَاعِثَهُ لاَ يَصِيرُ مُحْرِمًا وَلاَ يَحْرُمُ عَلَيْهِ شيء بِذَلِكَ
Sahih Muslim 1321 f

'A'isha (Allah be pleased with her) reported:

Allah's Messenger (ﷺ) sent the sacrificial animals and I wove garlands for them with my own 'hands, and he did not refrain from doing anything which he did not avoid in the state of non-Muhrim.
وَحَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ، وَيَعْقُوبُ بْنُ إِبْرَاهِيمَ الدَّوْرَقِيُّ، قَالَ ابْنُ حُجْرٍ حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، عَنْ أَيُّوبَ، عَنِ الْقَاسِمِ، وَأَبِي، قِلاَبَةَ عَنْ عَائِشَةَ، قَالَتْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَبْعَثُ بِالْهَدْىِ أَفْتِلُ قَلاَئِدَهَا بِيَدَىَّ ثُمَّ لاَ يُمْسِكُ عَنْ شَىْءٍ لاَ يُمْسِكُ عَنْهُ الْحَلاَلُ ‏.‏
Reference : Sahih Muslim 1321f
In-book reference : Book 15, Hadith 403
USC-MSA web (English) reference : Book 7, Hadith 3037
  (deprecated numbering scheme)