From Sahih Bukhari (Hadith 1311):
Narrated Jabir bin `Abdullah:A funeral procession passed in front of us and the Prophet (ﷺ) stood up and we too stood up. We said, 'O Allah's Messenger (ﷺ)! This is the funeral procession of a Jew." He said, "Whenever you see a funeral procession, you should stand up
Reference: Bukhari 1311