"Praise the Lord, for He is good, for His mercy endures forever." This is what the verse says (Isaiah 3:10), "Say to the righteous that it is good." When a person mentions the righteous, they should mention them for good, as it says, "Say to the righteous that it is good." And when one mentions the wicked, they should mention them for evil, as it says (Isaiah 3:11), "Woe to the wicked for their evil deeds."
Similarly, it says (Proverbs 10:7), "The memory of the righteous is a blessing." And so too, when the Holy One, blessed be He, mentions Abraham the righteous, He blesses him, as it says (Genesis 18:17), "Shall I hide from Abraham what I am about to do?" What is written afterwards? (Genesis 18:18) "Abraham will surely become a great and powerful nation." And when one mentions Amalek, they curse him, as it says (Deuteronomy 25:17), "Remember what Amalek did to you."
What is written afterwards? (Deuteronomy 25:19) "Blot out the memory of Amalek." Therefore, say to the righteous that it is good. Another interpretation of "Say to the righteous that it is good" is that the fruit of their deeds will be eaten, as blessings produce fruit, while curses do not, as it says, "Woe to the wicked for their evil deeds, for what their hands have done will be done to them." The term "fruit" is used here only to teach that no fruit is produced from curses.
Another interpretation of "Say to the righteous that it is good" is that the Holy One, blessed be He, calls the righteous good. On Rosh Hashanah, all nations stand in judgment before the Holy One, blessed be He, and each nation says, "We have triumphed in judgment." But on Yom Kippur, the Holy One, blessed be He, pardons Israel and forgives their sins, as it says (Leviticus 16:30), "For on this day He will forgive you."
Yet, we still do not know who won the judgment, whether Israel or the nations of the world. When the holiday of Sukkot arrives, all Israel take their lulavs and proclaim their faith in the righteous one of the world, as if he has come and conquered, and they know that Israel has won the judgment. Therefore, say to the righteous that it is good