Hadith 6:659
Ibn Fudayl narrated to us, from Yazid, from Abdullah ibn al-Harith, who said: The Messenger of Allah (peace and blessings of Allah be upon him) prayed over Hamzah and performed nine takbirs over him. Then another [body] was brought, and he performed seven takbirs over it. Then another was brought, and he performed five takbirs over it, until he finished with them, except that they were odd-numbered.
حدثنا بن فضيل عن يزيد عن عبد الله بن الحارث قال صلى رسول الله صلى الله عليه وسلم على حمزة وكبر عليه تسعا ثم جيء بالأخرى فكبر عليها سبعا ثم جيء بالأخرى فكبر عليها خمسا حتى فرغ عنهن غير أنهن كن وترا