Midrash su Salmi 78:65

“Haman said to King Aḥashverosh: There is one people that is scattered and dispersed among the peoples in all the provinces of your kingdom; their laws are different from every people’s, and they do not keep the king’s laws; it is not worthwhile for the king to tolerate them” (Esther 3:8).
“Haman said to King Aḥashverosh: There is [yeshno] one people” – the one of whom it is stated: “The Lord is one” (Deuteronomy 6:4); He is asleep [yashen] for His people. The Holy One blessed be He said to him [Haman]: ‘There is no sleep before Me; that is what is written: “Behold, the guardian of Israel neither slumbers nor sleeps” (Psalms 121:4), and you say that there is sleep before Me? By your life, I will awaken from sleep against that man and eliminate him from the world;’ that is what is written: “Then the Lord awoke as if from sleep…He drove his foes into retreat” (Psalms 78:65–66).
Another matter: “There is one people” – he [Haman] said: ‘Their teeth are big, as they eat and drink and say: Delight in Shabbat, delight in the festivals. They cause a decrease in the assets of the world; once every seven days – Shabbat, once every thirty days – the New Moon, in Nisan – Passover, in Sivan – Shavuot, in Tishrei – Rosh Hashana and the great fast [Yom Kippur], and the festival of Sukkot.’ Aḥashverosh said to him: ‘So they are commanded in their Torah.’ Haman said to him: ‘Had they observed their holidays and our holidays, they would have done well, but they treat your holidays with contempt. “And they do not follow the king’s laws” – as they observe neither calends nor Saturnalia.’ The Holy One blessed be He said to him: ‘Wicked one, you are casting aspersions on their festivals, I will bring you down before them and they will add another festival over your downfall.’ These are the days of Purim; that is what is written: “A fool’s mouth is ruin for him” (Proverbs 18:7).
“It is not worthwhile for the king to tolerate them.” For everything that Haman denounced Israel below, [the angel] Michael would advocate for them above. He said before Him: ‘Master of the universe! Your children are being denounced not because they engaged in idol worship, and not for engaging in licentiousness, and not for bloodshed; rather they are being denounced for observing your laws.’ He said to him: ‘I have not, and I will not forsake them.’ That is what is written: “For the Lord will not forsake His people for the sake of His great name” (I Samuel 12:22). Whether they are guilty or innocent, in any case it is impossible to forsake them, because the world cannot exist without Israel.
“If a man were to give all the wealth of his house…” (Song of Songs 8:7) – that is Haman the wicked, who gave ten thousand silver talents to obliterate Israel, “…he would be scorned” (Ibid.).

The right hand of the Lord is exalted; the right hand of the Lord doeth valiantly (Ps. 118:16). That is, when they do the will of God, He that keepeth Israel doth neither slumber nor sleep (ibid. 121:4). However, when they fail to do His will, Then the Lord awaked as one asleep (ibid. 79:65). When the people do the will of God, Fury is not in Me (Isa. 27:4), but when they fail to do his will, And the anger of the Lord be kindled (Deut. 7:4). When they act in accordance with His decrees, The Lord will fight for you (Exod. 14:14), But when they fail to fulfill His wishes, He returned to be their enemy (Isa. 63:10). Furthermore, His mercy is transformed into tyranny: The Lord is become as an enemy, He hath swallowed up Israel (Lam. 2:5). Dasheth (tiraz) in pieces the enemy (Exod. 15:6). This alludes to the future, as it is said in the verse Thou wilt march (tiz’ad) through the earth in indignation (Hab. 3:12). Dasheth in pieces the enemy. This refers to Edom, as it is said: Because the enemy hath said against you (Ezek. 36:2).