Slopes are mentioned in the Quran in these verses:

[28:29] When he had fulfilled his obligation, he traveled with his family (towards Egypt). He saw from the slope of Mount Sinai a fire. He said to his family, “Stay here. I have seen a fire. Maybe I can bring to you news, or a portion of the fire to warm you.”

[28:44] You were not present on the slope of the western mount, when we issued the command to Moses; you were not a witness.

[28:45] But we established many generations, and, because of the length of time, (they deviated). Nor were you among the people of Midyan, reciting our revelations to them. But we did send messengers.

[28:46] Nor were you on the slope of Mount Sinai when we called (Moses). But it is mercy from your Lord, (towards the people,) in order to warn people who received no warner before you, that they may take heed.

To learn more, read the Quran in English.

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