Midrash for Deuteronomy 28:63

(I. Kings 22, 36) And there went a rinah (song) throughout the camp. R. Acha b. Chanina said (Prov. 11, 10) And when the wicked perish there is rinah; i.e., when Achab, the son of Omri, perished, there was rinah. Is this so? Does then the Lord rejoice over the downfall of the wicked? Behold it is written (II Chron. 20, 21) As they went out before the armed array and said: Give thanks unto the Lord; for unto everlasting endureth His kindness. And R. Jochanan said:"Why is it not said here He is good? Because the Holy One, praised be He! does not rejoice over the downfall of the wicked;" for R. Samuel b. Nachman said in the name of R. Jochanan: "What is the meaning of the passage (Ex. 14, 20) And the one came not near unto the other all the night; i.e., at that time the ministering angels wanted to sing their usual song before the Holy One, praised be He! but He said to them: 'My creatures (the Egyptians) are perishing in the sea, and ye want to sing.' " R. Jose b. Chanina said: "He Himself does not rejoice, but He causes others to rejoice. This can be proved from the following passage (Deut. 28, 63) And it shalt come to pass that as the Lord rejoiced, etc. It is written Yasiss (cause others to rejoice) and not Yassus, will rejoice Himself."