The Messenger of Allah ﷺ performed the funeral prayer for Najashi and said the takbir four times.
حدثنا ابن نمير حدثنا عبيد الله عن ابن شهاب عن سعيد بن المسيب
أن رسول الله ﷺ صلى على النجاشي فكبر عليه أربعا
No references are available.
Its isnad is sahih. Ubaydullah is Ibn Umar bin Hafs bin Asim, and the hadith is a repeat of 7147, and an abridgment of 7763.