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 g

Al-Qasim reported the Mother of the Faithful (Hadrat 'A'isha Siddiqa) (Allah be pleased with her) as saying:

I used to weave these garlands from the multicoloured wool which was with us. The Messenger of Allah (ﷺ) was in the state of non Muhrim among us, and he would do all that was lawful for a lion-Muhrim with his wife.
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا حُسَيْنُ بْنُ الْحَسَنِ، حَدَّثَنَا ابْنُ عَوْنٍ، عَنِ الْقَاسِمِ، عَنْ أُمِّ الْمُؤْمِنِينَ، قَالَتْ أَنَا فَتَلْتُ، تِلْكَ الْقَلاَئِدَ مِنْ عِهْنٍ كَانَ عِنْدَنَا فَأَصْبَحَ فِينَا رَسُولُ اللَّهِ صلى الله عليه وسلم حَلاَلاً يَأْتِي مَا يَأْتِي الْحَلاَلُ مِنْ أَهْلِهِ أَوْ يَأْتِي مَا يَأْتِي الرَّجُلُ مِنْ أَهْلِهِ ‏.‏
Reference : Sahih Muslim 1321g
In-book reference : Book 15, Hadith 404
USC-MSA web (English) reference : Book 7, Hadith 3038
  (deprecated numbering scheme)