Musnad Ahmad 534:0

Narrated Abdullah ibn Busr al-Mazini: The Prophet (ﷺ) said: "The best of people is he whose life is long and whose deeds are good." A man said: "O Messenger of Allah, which deed is best?" He (ﷺ) said: "That your tongue remains moist with the remembrance of Allah, the Mighty and Majestic."