Muraqqa' al-Tamimi narrates: I offered a funeral prayer with Sayyiduna Zayd bin Arqam (may Allah be pleased with him), and he said five takbirs. Then he said: I prayed with the Messenger of Allah (peace and blessings be upon him) and he (peace and blessings be upon him) said five takbirs, so I will not abandon them for anyone after him (peace and blessings be upon him).
Hadith Referenceالمعجم الكبير للطبراني / باب الزاي / 5062