وَاعْلَمُوا أَنَّ دَارَ الْهِجْرَةِ قَدْ قَلَعَتْ بِأَهْلِهَا وَقَلَعُوا بِهَا، وَجَاشَتْ جَيْشَ الْمِرْجَلِ، وَقَامَتِ الْفِتْنَةُ عَلَى الْقُطْبِ، فَأَسْرِعُوا إِلَى أَمِيرِكُمْ، وَبَادِرُوا جَهَادَ عَدُوِّكُمْ، إِنْ شَاءَ اللهُ عزَّ وَجَلَّ.
You should know that Medina has been vacated by its residents and they have abandoned it. It is boiling like a huge cooking pot and rebellion is fixed on its axis moving with full force. So, hasten towards your amīr (commander) and proceed forward to fight your enemy, if so wills Allāh to Whom belongs Might and Majesty.