Musar su Salmi 39:7

Rabbi Yitzchak was sitting beside Rabbi Yehudah’s doorway one day, filled with sadness. Rabbi Yehudah came out and found him sitting there filled with sadness and asked, “Why is this day different from other days?” He replied, “I came to you to request three things: First, that when you speak words of Torah and mention things that I have said, say them in my name in order that my name will be mentioned. Second, see to it that my son Yosef merits Torah. And third, go to my grave every day during the seven days of mourning and pray for me.” Rabbi Yehudah said to him, “How do you know [that your time is approaching]?” He answered, “My soul departs from me every night and no longer enlightens me with dreams as formerly. Moreover, when I pray and arrive at the blessing, ‘Who hears prayer,’ I contemplate my form but I can no longer see it. Therefore I said to myself that since my image has departed from me so that I can no longer see it, it is clear that the announcement has already been made. For thus is it written, ‘Yet in his image a man walks’ (Tehillim 39:7). [That is, as long as a man’s image is perceivable] his spirit is maintained on account of it. But once it has departed and is no longer seen, [it is proof that his passing is imminent].”