بُلُوغُ الْمَرَامِ
Bulugh al-Maram 609
The Book of Zakah
وَلَهُ شَاهِدٌ مُرْسَلٌ عِنْدَ اَلشَّافِعِيّ ِ [1] .
And it has a Shahid (supporting narration) that is Mursal narrated by Ash-Shafi'ee.
Sunnah.com reference: Book 4, Hadith 12