מדרש אויף במדבר 26:51

“Behold [hen], your time to die is approaching” (Deuteronomy 31:14) – Rabbi Aivu said: Moses said: ‘Master of the universe, with the matter that I lauded you in the midst of sixty myriad sanctifiers of Your name,²⁰"Behold [hen] the heavens and the heavens of the heavens belong to the Lord your God" (Deuteronomy 10:14). This was said to Israel, who numbered sixty myriad (See Numbers 26:51). with that You decreed death upon me, as it is stated: “Behold, your time to die is approaching” – all measures dispensed by the Holy One blessed be He, are dispensed measure for measure. But this is an evil measure for a good measure, a lacking measure for a full measure, a restricted measure for an ample measure.’ The Holy One blessed be He said to Moses: ‘This, too, is a good measure, that I said “behold [hen]” to you, as it is stated: “Behold [hineh], I am sending an angel” (Exodus 23:20); “behold [hen], restitution will be made to the righteous” (Proverbs 11:31); “behold [hineh], I am sending Elijah the prophet to you” (Malachi 3:23). Just as you exalted Me over sixty myriads, so, I will exalt you in the future in the midst of fifty-five myriads of full-fledged righteous ones, as it is stated: Hen, this is the numerical value of hen: Heh – five, nun – fifty.’