Will Ahura Mazda have to look down to see Abaddon's dwelling??
Let’s work this out in a step by step way to be sure we have the right answer.
yes
Abaddon is a demon that is said to dwell in a bottomless pit below the earth that is a realm of the dead.

Ahura Mazda is the chief deity of Zoroastrianism.

Ahura Mazda is the Supreme Being located in heaven, high above the sky.

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So, the answer is yes