Bukhari

Hadith Footnote:
That is, there will be no building, path, garden, mound, or mountain in it.
The Qur'anic verses indicate that the land of resurrection will be different, as is evident from the verse: ﴿ يَوْمَ تُبَدَّلُ الْأَرْضُ غَيْرَ الْأَرْضِ ﴾ (: Ibrahim: 48).

Hadith Commentary:
(1)
At that time, there will be no house, road, garden, mountain, or river, etc. on the earth; rather, the current form and appearance of the earth will be changed, as Allah the Exalted has stated:
“The Day when the earth and the heavens will be changed.” (: Ibrahim 14:48)
(2)
From some verses of the Noble Qur’an, the form of change in the earth that emerges is that on that day there will be no elevation or depression on the earth.
All mountains will be leveled to the ground, and all pits will be filled.
Similarly, the surface of the earth will be made even and will be much more expansive than before.
And the most significant change will be that the seas, rivers, and streams will be dried up.
Since the area of the sea’s surface is three times greater than that of the land, in this way, the transformed earth will be at least four times larger than the present earth, and instead of elevations and depressions, the entire earth will be level.
(3)
For this new earth and new heavens, the natural laws will also be different from the current laws, and it is on this very earth that Allah the Exalted’s court will be established.
The scale (mizan) for weighing deeds will also be set up on this earth, and then, according to people’s deeds, the decisions of reward and punishment will also be made at this very place.
In summary, Allah the Exalted, by His perfect power, will change the current form of the earth and, by creating the capacity for nourishment in it, will turn it into bread, so that during the long period of the Gathering (Mahshar), the believers may eat from beneath their feet and not suffer from hunger for such a long duration; as a side dish, ox liver and pieces of fish will be provided.
And Allah is the One whose help is sought.

Hadith Commentary: Benefits and Issues: By "the ten days of Dhu al-Hijjah," the first nine days of Dhu al-Hijjah are meant, because the tenth day is the day of Eid al-Adha. The Prophet (sallallahu alayhi wa sallam) may have left fasting on these days for some reason, otherwise, performing righteous deeds during this ten-day period holds great merit. This is because the Messenger of Allah (sallallahu alayhi wa sallam) said, "There are no days in which righteous deeds are more beloved to Allah than these days." (Bukhari) The term "righteous deeds" (‘amal salih) is general; it includes every good and virtuous act, whether it is fasting, prayer, remembrance (dhikr), recitation of the Qur’an, charity, or almsgiving. Previously, it has been mentioned in a narration regarding the ninth of Dhu al-Hijjah that it becomes an expiation for the sins of the previous and coming year, and in Sunan Abi Dawud, there is mention of the Prophet (sallallahu alayhi wa sallam) fasting on the nine days of Dhu al-Hijjah.

In Sunan al-Nasa’i, it is narrated from Hafsah (radi Allahu anha) that:

(أَرْبَعٌ لَمْ يَكُنْ يَدَعُهُنَّ النَّبِيُّ صلى الله عليه وسلم صِيَامَ عَاشُورَاءَ وَالْعَشْرَ وَثَلاَثَةَ أَيَّامٍ مِنْ كُلِّ شَهْرٍ وَرَكْعَتَيْنِ قَبْلَ الفجر)

There were four things which the Prophet (sallallahu alayhi wa sallam) never abandoned:
1. The fast of ‘Ashura (that day).
2. The fast of the ten days of Dhu al-Hijjah.
3. Three fasts every month.
4. Two rak‘ahs before the dawn (fajr) prayer.