Arabic (Original)
وَإِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَوْ يَعْلَمُ النَّاسُ مَا فِي التَّأْذِينِ لَتَضَارَبُوا عَلَيْهِ بِالسُّيُوفِ.
English Translation
And the Messenger of God (peace and blessings be upon him) said: "If people knew what is in the call to prayer, they would fight each other over it with swords."