“Once I was with abu ‘Abd Allah (a.s.), when Mehzam came to visit him (the Imam) and abu ‘Abd Allah (a.s.), said to me, ‘Call the slave-girl to bring for us oil.’ I called her, she brought a bottle of viola, and it was a cold day. Mehzam poured a certain amount on his palm, then said, ‘I pray to Allah to keep my soul in service for your cause, this is viola and the day is very cold.’ He (the Imam) asked, ‘What about it, O Mehzam?’ He replied, ‘Our physicians in al-Kufah think that viola is of cold nature.’ He (the Imam) said, ‘It is cool in summer and it is soft and warm in winter.’”