The Prophet ﷺ said, "When you perfume the deceased with incense, do so three times."
حدثنا يحيى بن آدم حدثنا قطبة عن الأعمش عن أبي سفيان
قال النبي ﷺ إذا أجمرتم الميت فأجمروه ثلاثا
No references are available.
Its isnad is sahih, and Qutbah bin Abdul-Aziz was deemed trustworthy by them. The hadith is found in Hakim 1/355, who graded it sahih, and Dhahabi agreed with him, and also in Bayhaqi 3/405.