Mu'jam al-Saghir

Hadith Commentary:
There are seven layers of the earth.
Whoever usurps even a span of land, it is as if he has usurped up to all seven layers.
Therefore, on the Day of Resurrection, the yoke of all of them will be placed around his neck.
In another narration, it is mentioned that he will be ordered to bring all that soil (from the seven layers).
Some have said that the meaning of placing the yoke is that he will be sunk into it up to the seven layers.
Some have deduced from the hadith that the earths are seven, just as the heavens are seven.
(Wahidi)

Hadith Commentary:
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Imam Bukhari rahimahullah has interpreted from these ahadith the verse: ﴿وَمِنَ الْأَرْضِ مِثْلَهُنَّ﴾ that just as there are seven heavens, there are also seven layers of the earth, and they are positioned one above the other like the heavens.

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The meaning of the third hadith is that in the Age of Ignorance (Jahiliyyah), people used to postpone the month of Muharram to Safar. The Noble Qur’an has referred to this act of theirs as "Nasi’" (postponement). They would advance or delay the months so that they could engage in war and looting during that month; thus, they would make Muharram into Safar. They would do this every year, continually transferring Muharram to another month, until eventually it would return to its designated time from which they had moved it forward.

In short, at the time of the Hajj of the Messenger of Allah sallallahu alayhi wa sallam, the months had returned to the same order in which Allah Ta’ala had arranged them. And Hajj took place in Dhu al-Hijjah, which is its proper time, whereas the Hajj of Abu Bakr radi Allahu anhu before this had occurred in Dhu al-Qa’dah.

And Allah knows best. In summary, from the explicit text of the Qur’an, the existence of seven heavens and, similarly, seven earths is established. Whoever denies this is, in effect, denying the Qur’an. Now, to investigate the reality of the seven heavens and seven earths is beyond human capability.