וַיְהִ֗י בִּֽהְי֣וֹת יְהוֹשֻׁעַ֮ בִּירִיחוֹ֒ וַיִּשָּׂ֤א עֵינָיו֙ וַיַּ֔רְא וְהִנֵּה־אִישׁ֙ עֹמֵ֣ד לְנֶגְדּ֔וֹ וְחַרְבּ֥וֹ שְׁלוּפָ֖ה בְּיָד֑וֹ וַיֵּ֨לֶךְ יְהוֹשֻׁ֤עַ אֵלָיו֙ וַיֹּ֣אמֶר ל֔וֹ הֲלָ֥נוּ אַתָּ֖ה אִם־לְצָרֵֽינוּ׃
And it came to pass, when Joshua was by Jericho, that he lifted up his eyes and looked, and, behold, there stood a man over against him with his sword drawn in his hand; and Joshua went unto him, and said unto him: ‘Art thou for us, or for our adversaries?’ .
Zohar
And so said Rabbi Joshua ben Levi, the Angel of Death said to me "If I was not concerned for the honor of creations, I would reveal to them the House of Slaughter, just as an animal"...