9:8):

+ 428 Rabbi Eliezer would say: The honor of your fellow should be as precious to you as your own, and do not be easy to anger. Repent one day before your death. Asked his disciples: Does a man know on which day he will die? Said he to them: So being the case, he should repent today, for perhaps tomorrow he will die; hence, all his days are passed in a state of repentance. Indeed, so said Solomon in his wisdom (Ecclesiastes 9:8): 'At all times, your clothes should be white, and oil should not lack from your head'" (Talmud, Shabbat 153a). Pirkei Avot 2:10