출애굽기 11:7의 Liturgy

[Yalkut Shimoni, Bo 187:] Rabbi Yeshayah, student of Rabbi Ḥanina ben Dosa, fasted eighty-five fasts. He said, “Dogs, about which it is written, ‘the dogs are brazen of spirit; they do not know satisfaction' — shall they merit saying a song?” An angel answered him from Heaven and said to him, “Yeshayah, until when will you fast over this? It is an oath from the blessed Holy One; from the day that he revealed his secret to Havakuk the prophet, he has not revealed this matter to anyone in the world. But because you are the student of a great man, I have been sent from Heaven to assist you. They said that dogs have written about them, ‘No dog sharpened its tongue against any of the children of Yisra’el'. Furthermore, they merited that hides are tanned with their excrement, on which Tefillin, Mezuzot, and Torah scrolls are written. For this reason they merited saying a song. And regarding what you asked, take back your word and do not continue in this way, as it is written, ‘He that guards his mouth and tongue, guards from afflictions of his soul.’” Blessed is YHVH forever, Amen and Amen.