Midrash sa 1 Cronica 29:15: Midrash Tanchuma, Midrash Tanchuma Buber, Sifra & Mekhilta DeRabbi Yishmael

And the time drew near that Israel must die (Gen. 47:29). It is stated in Scripture in reference to this verse: For we are strangers before Thee, and sojourners, as all our fathers were; our days on the earth are as a shadow, and there is no hoping (I Chron. 29:15). Our days are as a shadow. Would that they were as the shadow of a wall or a tree,¹That our days might be as permanent as a wall. but the fact is that they are as the shadow of a bird, as it is said: His days are as a shadow that passeth away (Ps. 144:14).

(Gen. 47:29:) THEN, WHEN THE DAYS FOR ISRAEL TO DIE DREW NEAR…. This text is related (to I Chron. 29:15): FOR WE ARE SOJOURNERS BEFORE YOU AND TRANSIENTS LIKE ALL OUR ANCESTORS; {FOR} OUR DAYS UPON EARTH ARE [LIKE] A SHADOW, AND THERE IS NO HOPE.⁴Gen. R. 96:2; Tanh., Gen. 12:1. And < they are > not like the shadow of a wall or like the shadow of a tree. Rather they are like the shadow of a bird, as stated (in Ps. 144:4): {OUR} [HIS] DAYS ARE LIKE A PASSING SHADOW.⁵Eccl. R. 1:2:1. (I Chron. 29:15, end:) AND THERE IS NO HOPE: There is no one who does not expect to die. All know that they are going to die. Abraham said (in Gen. 15:2): FOR I AM GOING (i.e., dying) CHILDLESS. Isaac said (in Gen. 27:4): BEFORE I DIE. Jacob said (in Gen. 47:30): WHEN I SLEEP WITH MY ANCESTORS. When? When he was on the point of death (according to Gen. 47:29): THEN, WHEN THE DAYS FOR ISRAEL TO DIE DREW NEAR.

[(Gen. 37:1:) NOW JACOB DWELT < IN THE LAND >.] This text is related (to I Chron. 29:15): FOR WE ARE SOJOURNERS BEFORE YOU [AND TRANSIENTS LIKE ALL OUR ANCESTORS]. So are the righteous. The Holy One had made them the essential thing, but they make themselves subordinate. In the case of Abraham, the Holy One had magnified him, as stated (in Gen. 12:2): I WILL BLESS YOU AND MAGNIFY YOUR NAME. And so (in Gen. 13:17): ARISE, WALK ABOUT THE LAND < THROUGHOUT ITS LENGTH AND BREADTH, FOR I AM GIVING IT TO YOU >. < Yet > he says to the children of Heth (i.e., to the Hittites, in Gen. 23:4): I AM AN ALIEN AND A TRANSIENT AMONG YOU. So also with Isaac, the Holy One magnified him, as stated (in Gen. 26:12): SO ISAAC SOWED ON THAT LAND < AND REAPED IN THAT YEAR A HUNDREDFOLD, FOR THE LORD HAD BLESSED HIM >. It also says (in Gen. 26:6): SO ISAAC {SOJOURNED} [DWELT] IN GERAR. And so with Jacob (according to Gen. 36:6): NOW JACOB DWELT IN THE LAND WHERE HIS FATHER HAD SOJOURNED. It is therefore stated (in I Chron. 29:16): FOR WE ARE SOJOURNERS BEFORE YOU AND TRANSIENTS LIKE ALL OUR ANCESTORS.