When the Egyptians were drowning in the Red Sea, the angels in heaven began to break forth in songs of jubilation, but the Holy One, blessed be He, silenced them: “My creatures are perishing — and ye are ready to sing!”

The Talmud (AD 200-500) Collection of Jewish rabbinical writings

Babylonian Talmud, Sanhedrin, Perek 4, 39B

Steinsaltz trans.:

At that time the ministering angels desired to recite a song before the Holy One, Blessed be He. The Holy One, Blessed be He, said to them: My handiwork, i.e., the Egyptians, are drowning in the sea, and you are reciting a song before Me?

Louis I. Newman, comp. The Talmudic Anthology, 103 (1945):

When the Egyptians were drowning, the angels wished to sing. But God said, "My children are dying, and you would sing?"