The Prophet ﷺ said the takbir four times.
حدثنا أبو هشام الرفاعي ومحمد بن الصباح وأبو بكر بن خلاد قالوا حدثنا يحيى بن اليمان عن المنهال بن خليفة عن حجاج عن عطاء
أن النبي ﷺ كبر أربعا
No references are available.
Grading, [Sahih] Bayhaqi narrated it, 4/55, from the hadith of Yahya bin Yaman with this wording at length, and he said, "This chain is daif. Hajjaj is Ibn Artah (1129496), and Minhal bin Khalifah is daif (Taqrib)."I say, as for saying the takbir four times in funeral prayers, that is established through sahih chains. Bukhari and Muslim and others narrated it. See no. 1534 and other hadiths in this book. It seems Imam Ibn Majah gathered in this chapter only the unusual narrations.