“And certainly thy Lord shall give unto thee, and thou shalt be satisfied.” (93:5)
As one scholar said in joy after contemplating this verse:
قرأنا في الضحى ولسوف يعطي * فسرّ قلوبنا ذاك العطاء
وحاشا يا رسول الله ترضى * وفينا من يعذب أو يساء
We read in Surat al-Doha “thy Lord shall give unto thee”
and this giving has brought pleasure to our hearts
And God forbid, oh Rasool Allah, that you would be satisfied
when amongst us are those who are being hurt or tortured. 
The great Qur’an commentator and Hadith expert, shaykh Ahmad ibn Idris al-Fasi (may Allah be pleased with him), wrote in his commentary on this verse:
“It is said that this is the most hope-giving aya in the Qur’an, and so said the Prophet (salla Allahu alayhi wa sallam), (for) he said: “I will not be satisfied while someone from my ummah is in the Fire.” And it is known that the speech of the Prophet is truthful, and that it is impossible for what he says to not be as he said, and so is the speech of Allah Most High.
What this means in the end, is that Allah Most High will not be satisfied unless the entire Ummah is out (of the Fire), and his satisfaction is something that will happen without doubt. If you want to show this outcome by rational proof and logical reasoning, it is thus:
(1) The ummah coming out of the Fire satisfies the Prophet salla Allahu alayhi wa sallam, and
(2) the satisfaction of the Prophet salla Allahu alayhi wa sallam will happen without doubt…
The proof of the first is his saying, salla Allahu alayhi wa sallam: “I will not be satisfied…”
And the proof of the second is His saying Most High, “and thou shalt be satisfied.”
The outcome of this: Is that the entire ummah will come out of the Fire, without doubt. 
 Muhammad bin Alawi al-Maliki, Al-Dhakha’er al-Muhammadiyya, Cairo: Dar Jawaami al-Kalim.
 Ahmad ibn Idris, Al-Fuyoodat al-Rabbaniyya, Cairo: Dar Jawaami al-Kalim.