Hadithcore
Musnad Ahmad 1568
sahih· Darussalam

Ghunaim narrated: I asked Sa"d bin Abi Waqqas about tamattu ," [in Hajj.

He said: We did that when this one was still a disbeliever living in Makkah - referring to Mu"awiyah.

References1 variant
Arabic/English book
Book 8, Hadith 1568