Messenger of Allah ﷺ said, "Whoever possesses the (following) three qualities will have the sweetness of faith (1): The one to whom Allah and His Apostle becomes dearer than anything else; (2) Who loves a person and he loves him only for Allah's Sake; (3) who hates to revert to atheism (disbelief) as he hates to be thrown into the Fire."  

قَالَ رَسُولُ اللَّهِ ﷺ ثَلاَثٌ مَنْ كُنَّ فِيهِ وَجَدَ حَلاَوَةَ الإِيمَانِ أَنْ يَكُونَ اللَّهُ وَرَسُولُهُ أَحَبَّ إِلَيْهِ مِمَّا سِوَاهُمَا وَأَنْ يُحِبَّ الْمَرْءَ لاَ يُحِبُّهُ إِلاَّ لِلَّهِ وَأَنْ يَكْرَهَ أَنْ يَعُودَ فِي الْكُفْرِ كَمَا يَكْرَهُ أَنْ يُقْذَفَ فِي النَّارِ  

I heard Saʿid bin Zaid saying, "I have seen myself tied and forced by ʿUmar to leave Islam (Before ʿUmar himself embraced Islam). And if the mountain of Uhud were to collapse for the evil which you people had done to ʿUthman, then Uhud would have the right to do so." (See Hadith No. 202, Vol. 5)  

لَقَدْ رَأَيْتُنِي وَإِنَّ عُمَرَ مُوثِقِي عَلَى الإِسْلاَمِ وَلَوِ انْقَضَّ أُحُدٌ مِمَّا فَعَلْتُمْ بِعُثْمَانَ كَانَ مَحْقُوقًا أَنْ يَنْقَضَّ  

We complained to the Messenger of Allah ﷺ (about our state) while he was leaning against his sheet cloak in the shade of the Kaʿba. We said, "Will you ask Allah to help us? Will you invoke Allah for us?"

He said, "Among those who were before you a (believer) used to be seized and, a pit used to be dug for him and then he used to be placed in it. Then a saw used to be brought and put on his head which would be split into two halves. His flesh might be combed with iron combs and removed from his bones, yet, all that did not cause him to revert from his religion."

"By Allah! This religion (Islam) will be completed (and triumph) till a rider (traveler) goes from Sanʿa' (the capital of Yemen) to Hadramout fearing nobody except Allah and the wolf lest it should trouble his sheep, but you are hastey."  

شَكَوْنَا إِلَى رَسُولِ اللَّهِ ﷺ وَهْوَ مُتَوَسِّدٌ بُرْدَةً لَهُ فِي ظِلِّ الْكَعْبَةِ فَقُلْنَا: «أَلاَ تَسْتَنْصِرُ لَنَا أَلاَ تَدْعُو لَنَا؟

فَقَالَ: «قَدْ كَانَ مَنْ قَبْلَكُمْ يُؤْخَذُ الرَّجُلُ فَيُحْفَرُ لَهُ فِي الأَرْضِ فَيُجْعَلُ فِيهَا، فَيُجَاءُ بِالْمِنْشَارِ فَيُوضَعُ عَلَى رَأْسِهِ فَيُجْعَلُ نِصْفَيْنِ، وَيُمَشَّطُ بِأَمْشَاطِ الْحَدِيدِ مَا دُونَ لَحْمِهِ وَعَظْمِهِ، فَمَا يَصُدُّهُ ذَلِكَ عَنْ دِينِهِ۔

وَاللَّهِ! لَيَتِمَّنَّ هَذَا الأَمْرُ حَتَّى يَسِيرَ الرَّاكِبُ مِنْ صَنْعَاءَ إِلَى حَضْرَمَوْتَ، لاَ يَخَافُ إِلاَّ اللَّهَ وَالذِّئْبَ عَلَى غَنَمِهِ، وَلَكِنَّكُمْ تَسْتَعْجِلُونَ۔»