Concerning Allah's statement,

ثُمَّ نُنَجِّي الَّذِينَ اتَّقَوا ...

Then We shall save those who had Taqwa.

When all of the creatures passed over the Hellfire, and those disbelievers and the disobedient people who are destined to fall into it because of their disobedience, Allah will save the believers and the righteous people from it because of their deeds.

Therefore, their passing over the bridge and their speed will be based upon their deeds that they did in this life.

Then, the believers who performed major sins will be allowed intercession. The angels, the Prophets and the believers will all intercede. Thus, a large number of the sinners will be allowed to come out of Hell. The fire will have devoured much of their bodies, except the places of prostration on their faces. Their removal from the Hellfire will be due to the faith in their hearts.

The first to come out will be he who has the weight of a Dinar of faith in his heart. Then, whoever has the next least amount after him. Then, whoever is next to that after him, and so forth. This will continue until the one who has the tiniest hint of faith in his heart, equal to the weight of an atom.

Then, Allah will take out of the Fire whoever said "La ilaha illallah,'' even one day of his entire life, even if he never performed any good deed.

After this, no one will remain in the Hellfire, except those it is obligatory upon to remain in the Hellfire forever.

This has been reported in many authentic Hadiths from the Messenger of Allah.

This is why Allah says,

ثُمَّ نُنَجِّي الَّذِينَ اتَّقَوا وَّنَذَرُ الظَّالِمِينَ فِيهَا جِثِيًّا ﴿٧٢﴾

Then We shall save those who had Taqwa. And We shall leave the wrongdoers in it, Jithyya.