Musnad Ahmad 30:1145

Abu Abd al-Rahman narrated to us, Sa'id ibn Abi Ayyub narrated to us, Ubayd Allah ibn Abi Ja'far narrated to me, from al-A'raj, from Abu Hurayrah, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever is offered perfume, let him not refuse it, for it is light to carry and pleasant in scent."