It wasnarrated that Ibn 'Abbas said:
"The Messenger of Allah (ﷺ)said: 'Whoever forgets to send peace and blessings upon me, then hehas missed the road to Paradise.'" (ES)
English reference (ES): Vol. 1, Book 5, Hadith 908 (ES)
Arabic reference (ES): Book 5, Hadith 961 (ES)