Reference for Chullin 177:10

(יחזקאל א, כו) כמראה אבן ספיר דמות כסא

and it is also written: The likeness of a throne as the appearance of a sapphire stone.<span class="x" onmousemove="('comment',' Ezek. I, 26. And whenever God sits upon His Throne of Glory He immediately thinks of the blue thread of the fringes worn by Israel, and bestows upon them blessings.');">⁸</span>

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