Hadith 771:50
Aswad ibn Amir narrated to us, Ja'far al-Ahmar informed us, from 'Abd al-'Aziz ibn Hakim, who said: I prayed behind Zayd ibn Arqam over a funeral, and he performed five takbirs. Then he turned and said: "This is how the Messenger of Allah, may Allah bless him and grant him peace, or your Prophet, may Allah bless him and grant him peace, performed the takbir."
حدثنا أسود بن عامر، أخبرنا جعفر الأحمر، عن عبد العزيز بن حكيم قال: صليت خلف زيد بن أرقم على جنازة فكبر خمسا، ثم التفت فقال: " هكذا كبر رسول الله صلى الله عليه وسلم أو نبيكم صلى الله عليه وسلم "