Amrah bint Abd al-Rahman (may Allah have mercy on her) narrates from Sayyidah Aishah (may Allah be pleased with her): I used to make the garlands for the sacrificial animals of the Messenger of Allah (peace and blessings be upon him) myself. Then the Messenger of Allah (peace and blessings be upon him) would garland them and send them off with Sayyiduna Abu Bakr (may Allah be pleased with him), and until the sacrifice was slaughtered, nothing of what Allah had made lawful became forbidden to him (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19045