All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger.
The Prophetic narration which you inquired about is reported by Imaam Ahmad from Ibn ‘Umar that he used to dye his clothes with saffron and wipe his skin with it. Then he [Ibn ‘Umar ] was asked, ‘‘Why do you dye this with saffron?" He replied, ‘‘It is because I saw that it was the most beloved dye to the Prophet ; he used to apply it on his skin and dye his clothes with it.’’
Allaah Knows best.