the prophet letter to oman

[zulfiqarchucknorris]

Peace,

I recently saw this letter, its from the prophet (PBUH) to the Kings of Oman.
رسالة الرسول إلى ملوك عمان
كتب  إلى ملك عُمَانَ كتابًا وبعثه مع عمرو بن العاص :

"بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ، مِنْ مُحَمَّدِ بْنِ عَبْدِ اللهِ إلَى جَيْفَرٍ وَعَبْدٍ ابْنَيِ الْجُلَنْدَى، سَلاَمٌ عَلَى مَنِ اتَّبَعَ الْهُدَى، أَمَّا بَعْدُ،
فَإِنِّي أَدْعُوكُمَا بِدِعَايَةِ الإِسْلاَمِ؛ أَسْلِمَا تَسْلَمَا، فَإِنِّي رَسُولُ اللهِ إِلَى النَّاسِ كَافَّةً؛ لأُنْذِرَ مَنْ كَانَ حَيًّا، وَيَحِقَّ الْقَوْلُ عَلَى الْكَافِرِينَ، فَإِنَّكُمَا إنْ أَقْرَرْتُمَا بِالإِسْلاَمِ وَلَّيْتُكُمَا، وَإِنْ أَبَيْتُمَا أَنْ تُقِرَّا بِالإِسْلاَمِ فَإِنَّ مُلْكَكُمَا زَائِلٌ عَنْكُمَا، وَخَيْلِي تَحُلُّ بِسَاحَتِكُمَا، وَتَظْهَرُ نُبُوَّتِي عَلَى مُلْكِكُمَا"
. وكتب أبيُّ بن كعب وختم رسول الله  الكتاب
ابن القيم: زاد المعاد 3/605، وابن سيد الناس: عيون الأثر في فنون المغازي والشمائل والسير 2/334
كتاب النبي إلى جيفر وعبد ابني الجلندي الأزديين
http://www.al-eman.com/الكتب/عيون الأثر في فنون المغازي والشمائل والسير **/كتاب النبي إلى جيفر وعبد ابني الجلندي الأزديين /i52&d54597&c&p1

to thos unable to read or understand arabic, here is the english translations:

"In the Name of Allâh, the Most Beneficent, the Most Merciful.

From Muhammad bin ‘Abdullah to Jaifer and ‘Abd Al-Jalandi.

Peace be upon him who follows true guidance; thereafter I invite both of you to the Call of Islam. Embrace Islam. Allâh has sent me as a Prophet to all His creatures in order that I may instil fear of Allâh in the hearts of His disobedient creatures so that there may be left no excuse for those who deny Allâh. If you two accept Islam, you will remain in command of your country; but if you refuse my Call, you’ve got to remember that all your possessions are perishable. My horsemen will appropriate your land, and my Prophethood will assume preponderance over your kingship."

Doesn't this seem threatening? The Prophets other letters tot the kings were peaceful, why was this one violent? In the other letters, it seemed the prophet was asking them to convert otherwise God will punish them. Why is this one different, is the Isnaad Sahih. is the letter displayed in Oman authentic, or could it be a forgery?

Answering Christianity made an article on this but it does not address the issue at hand
http://www.answering-christianity.com/bassam_zawadi/omani_delegation.htm

Thank You my freinds and Osama Abdallah for your site and helpl
Peace