Midrash su Malachia 3:20

(Ib. b) R. Chanina said in the name of R. Myashia, who quoted R. Juda b. Eliah: "What does the passage (Mal. 3, 20) But unto you, that fear My name, shall the sun arise, mean? This refers to men who are afraid to mention the name of the Lord in vain." Shall the sun of righteousness arise, with healing in its wings. Said Abaye: "We infer from this that the sunbeams are healing to sickness." This will differ with the opinion of R. Simon b. Lakish, who said: "There is no Gehenna in the future world, but the Holy One, praised be He! — will bring forth the sun from its sheath, with which the righteous will be cured and the wicked will be punished; as it is said (Mal. 3, 19) For, behold, the day cometh it burneth as a furnace; and all the proud, and all that work wickedness, shall be stubble; and the day that cometh shall set them ablaze, saith the Lord of Hosts, that it shall leave them neither root nor branches."

R. Isaac said: "Even in a year of drought, as were the years of Elijah, if rain fall on the Sabbath eve, it can only be considered as a sign of calamity." This significance [is attached to the occurrence also by] Rabba b. Shila, who said: "A rainy day is hard as the day of judgment [because it prevents people from pursuing their vocations]," Amemar said: "Had it not been for its necessity to the world, I would pray His mercy to abolish it." Further R. Isaac said: "Sunshine on the Sabbath is a generosity for the poor; as it is said (Malachi 3, 20) But, there shall be rise unto you that fear my name the sun of righteousness with healing in its wings." Again said R. Isaac: "Great is the day of rain, for then even the coin in one's pocket is blessed; for it is said (Deut. 28, 12) To give the rain of thy land in its season, and to bless all the work of thy hand." R. Isaac said again: "Heavenly blessing does not occur but in things which are hidden from the eyesight [the exact quantity of which is not known]; as it is said (Deut. 28, 8) The Lord will command upon thee the blessing in thy storehouses [where the exact quantity is unknown]." In the college of R. Ishmael it was taught: "Heavenly blessings will not be frequent except upon things of which no eye can look." Our Rabbis were taught: "He who is about to measure the grain in his barn, should say: 'May it be Thy will, O Lord, our God, that Thou shalt send blessing to the labor of our hands.' When he begins to measure off, he should say: 'Praised be He Who sendeth blessings upon this heap.' If, however, he prayed after measuring, his prayer is in vain, because [heavenly] blessing is not frequent on things which are weighed, measured or counted, but on things which are hidden from the eyesight; as it is said: The Lord will command upon thee the blessing in they storehouses [where the exact quantity is unknown]."

“May the Lord recompense your work, and may your reward be complete from the Lord, God of Israel, under whose wings you have come to take refuge” (Ruth 2:12).
“May the Lord recompense your work, and may your reward be complete [shelema] from the Lord.” Rabbi Ḥasa said.¹⁸¹Many commentaries suggest that a word is missing here, and that it should read as per Yalkut Shimoni Ruth 602: “Rabbi Ḥasa said: Solomon.” Thus, Rabba Ḥasa states that the word shelema alludes to the fact that Solomon [Shelomo] would be one of Ruth’s descendants. “Under whose wings [kenafav] you have come to take refuge.” Rabbi Avun said: We have heard that the land has wings, as it is stated: “From the end of [mikkenaf] the earth we have heard songs” (Isaiah 24:16). There are wings to the sun, as it is stated: “The sun of righteousness will shine for you who fear My name, with healing in its wings” (Malachi 3:20). There are wings for beasts, as it is stated: “The sound of the wings of the beasts” (Ezekiel 3:13). There are wings for cherubs, as it is stated: “For the cherubim spread their wings” (I Kings 8:7).There are wings for seraphs, as it is stated: “The seraphim stood above Him; each had six wings” (Isaiah 6:2). Come and see how great is the power of the righteous, and how great is the power of charity, and how great is the power of those who perform kindness, as they do not take shelter in the shadow of [the wings of] morning,¹⁸²The morning is also described as having wings, as in: “If I take the wings of morning” (Psalms 139:9). not in the shadow of the wings of the land, not in the shadow of the wings of the sun, not in the shadow of the wings of beasts, not in the shadow of the wings of cherubs, and not in the shadow of the wings of seraphs, but rather in the shadow of He who spoke and the world came into being, as it is stated: “How precious is Your kindness, God, and men take shelter in the shadow of Your wings” (Psalms 36:8).