Lo jádáti jom moti

And he said, “I am old now, and I do not know how soon I may die.

“He said: Behold, I have now grown old; I do not know the day of my death” (Genesis 27:2).
Rabbi Yehoshua ben Korḥa said: When a person reaches the age of his parents, five years before or five years after, he should be concerned about death, as Isaac said: ‘If I will reach the years of Father, now there are many remaining; if I will reach the years of my mother: “He said [to him]: Behold, I have now grown old; I do not know the day of my death.”
It is taught: There are seven matters that are obscured from people: The day of [their] death; the day of consolation; the profundity of justice; a person does not know through what he will profit; a person does not know what is in the heart of another; a person does not know what the woman is carrying in her pregnancy; and when the evil empire will fall. The day of death, from where is it derived? It is as it is written: “For a person, too, does not know his time” (Ecclesiastes 9:12). The day of consolation, from where is it derived? It is as it is written: “At its time, I will hasten it” (Isaiah 60:22). A person does not know the profundity of justice, as it is stated: “For judgment is God’s” (Deuteronomy 1:17). A person does not know through what he will profit, as it is written: “It is the gift of God” (Ecclesiastes 3:13). A person does not know what is in the heart of another, as it is written: “I, the Lord, probe the heart” (Jeremiah 17:10). A person does not know what the woman is carrying in her pregnancy, as it is written: “[You do not know]…how the fetuses grow in a womb of the pregnant” (Ecclesiastes 11:5). And when the evil empire will fall, as it is written: “For a day of vengeance is in My heart” (Isaiah 63:4).

לא ידעתי יום מותי I KNOW NOT THE DAY OF MY DEATH — R. Joshua the son of Korcha said: When a person approaches the age at which his parents died he may well be anxious five years before and five years after. Isaac was then one hundred and twenty three years old and he said, “Perhaps I shall only reach the age of my mother who died at the age of 127 and I am now within five years of her age: therefore, I know not the day of my death —I may only reach the age of my mother or it may be the age of my father” (Genesis Rabbah 65:12).

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