Sayyiduna Ziyad bin Jahur رضي الله عنه says: A letter from the Prophet صلى الله عليه وسلم came to me in which these words were written: «بِسْمِ اللّٰهِ الرَّحْمٰنِ الرَّحِيمِ، مِنْ مُحَمَّدٍ رَسُولِ اللّٰهِ صَلَّى اللّٰهُ عَلَيْهِ وَسَلَّمَ إِلَى زِيَادِ بْنِ جَهْوَرَ، سِلْمٌ أَنْتَ، فَإِنِّي أَحْمَدُ اللّٰهَ إِلَيْكَ، إِلَى اللّٰهِ الَّذِي لَا إِلٰهَ إِلَّا هُوَ، أَمَّا بَعْدُ، فَإِنِّي أُذَكِّرُكَ اللّٰهَ وَالْيَوْمَ الْآخِرَ، أَمَّا بَعْدُ، فَلْيُوضَعَنَّ كُلُّ دِينٍ دَانَ بِهِ النَّاسُ إِلَى الْإِسْلَامِ فَأَعْلَمُ ذٰلِكَ۔» "In the name of Allah, the Most Gracious, the Most Merciful. This letter is from Muhammad, the Messenger of Allah صلى الله عليه وسلم, to Ziyad bin Jahur. You are a Muslim. I praise Allah to you, besides whom there is no deity. After praise and peace, I remind you of Allah Almighty and the Day of the Hereafter. After this, every religion that people follow should be turned towards Islam. Know this."