كتاب الصلاة
2  
The Book of Prayer
ash-Shafi'i views the second ruling from
وَالْحُكْمُ اَلثَّانِي عِنْدَ "اَلشَّافِعِيِّ" مِنْ:

Sunnah.com reference : Book 2, Hadith 16
English translation : Book 2, Hadith 0
Arabic reference : Book 2, Hadith 164