Parashas Eikev · Passuk 11:21
to the end that you and your children may endure, in the land that GOD swore to your fathersifathers See note at 1.35. to assign to them, as long as there is a heaven over the earth.
Torah Temimah points to Yerushalmi ברכות.
TT lemma: כימי השמים וגו' (unit 9 of 9).
English: It was taught: The Sages say: the thickness of the firmament is a journey measured in years like the years of the first fathers, as it is said, “to your fathers … like the days of the heavens over the earth.”
Derash on the verse (Yerushalmi sugya) — not a formal named middah of the 13
Amoraic discussion in the Yerushalmi built on this passuk.
“Days of the heavens over the earth” is pressed into a cosmic measure linked to the fathers’ years.