Fussilat 41:10

He placed on it firm mountains standing high above it, showered His blessings upon it, and measured its sustenance totaling exactly four Days[4], for all who ask.

[4] These four Days include the first two Days, and the other two Days were: Tuesday and Wednesday.

And He placed on it [i.e., the earth] firmly set mountains over its surface, and He blessed it and determined therein its [creatures'] sustenance in four days without distinction[1384] - for [the information of] those who ask.

[1384] Also "four equal days" or "four days of completion."

10. He placed therein (i.e. the earth) firm mountains from above it, and He blessed it, and measured therein its sustenance (for its dwellers) in four Days equal (i.e. all these four days were equal in the length of time) for all those who ask (about its creation).

He placed therein firm hills rising above it, and blessed it and measured therein its sustenance in four Days, alike for (all) who ask;