Muslim

Hadith Commentary:
(1)
These fortunate individuals will enter Paradise in a single row, all at once.
In the hadith, the precedence and lateness refer to the crossing of the Bridge (Sirat).
From this, it is also understood that the gate of Paradise will be very wide.

(2)
Some scholars have interpreted the word مُتَمَاسِكِين to mean that they will enter Paradise in a dignified manner.
None among them will try to outpace the other.
(Fath al-Bari: 11/503)

(3)
In one hadith, it is mentioned that every servant will remain standing on his feet until he answers four questions before Allah, the Exalted.
(Jami‘ at-Tirmidhi, Description of the Day of Judgment, Hadith: 2416)
Those who will enter Paradise without reckoning will be exempt from this trial.
Similarly, some of the people of Hell will be cast into Hell at the very first opportunity; there will be no need for their reckoning at all.
And Allah knows best.

Hadith Footnote:
The narrator of the hadith is Hazrat Sahl bin Sa’d Sa’idi al-Ansari.
At the time of the Prophet’s (sallallahu alayhi wa sallam) passing, he was 15 years old.
He was among the last Companions (Sahabah) in Madinah, passing away in 91 AH.
Radi Allahu anhu wa ardah. Ameen.

Hadith Commentary:
(1)
These will be those fortunate individuals who will enter Paradise without any reckoning, and they will enter all at once in a single group. In a hadith narrated from Anas radi Allahu anhu, the Messenger of Allah sallallahu alayhi wa sallam said:
"Allah, the Exalted, has promised me that four hundred thousand people from my ummah will enter Paradise without reckoning."
Abu Bakr radi Allahu anhu submitted:
"O Messenger of Allah! What if there are more than that?" You joined both your hands together as a gesture, then for a second time also joined both hands together as a gesture. Umar radi Allahu anhu submitted:
"It is sufficient; if Allah wills, He can admit all of creation into Paradise with a single palm."
The Messenger of Allah sallallahu alayhi wa sallam said:
"Umar has spoken the truth."
(Musnad Ahmad: 165/3)
(2)
Hafiz Ibn Hajar rahimahullah says that its chain is excellent, but there is much disagreement regarding the narrator of the hadith, Qatadah.
He has written that Abu Sa'id al-Khudri radi Allahu anhu said:
"We calculated in the presence of the Messenger of Allah sallallahu alayhi wa sallam, and their number amounted to forty-nine hundred thousand."
(Fath al-Bari: 500/11)
And Allah knows best.

Hadith Commentary:
In one hadith, the characteristics of these fortunate individuals are described:
“They do not ask others for ruqyah (spiritual healing by recitation), do not use cauterization as a means of treatment, do not take bad omens, and place their trust only in their Lord.” (Sahih al-Bukhari, Kitab al-Riqaq, Hadith: 6541)

In the narration of Jami‘ at-Tirmidhi, it is stated:
“With every thousand, there will be seventy thousand.” (Jami‘ at-Tirmidhi, Sifat al-Qiyamah, Hadith: 2437)

In this way, the number of those who will enter Paradise without reckoning becomes forty-nine hundred thousand.

In Musnad Ahmad, it is mentioned that with each of these seventy thousand, there will be an additional seventy, seventy thousand.
(Musnad Ahmad: 6/1 and Silsilat al-Ahadith as-Sahihah, Hadith: 1484)

According to this calculation, this number reaches four billion, ninety million.

There will also be further increase in this number from Allah.