When I scanned the space on both sides of the Kathiawar forest (of this world) and mentally reviewed the names of generous donors of different countries, I failed to locate any other donor capable of donating his head.
TRADITION: Hazrat Gibril once said that Allah had scanned the East and the West but He did not find any other person worthier than the Prophet for the final apostleship.

'On either side of the forest I scanned,
in my mind, I went over all the generous one name,
No one offered his head, save you oh king!"

And recalled to my surveyed all over,
And recalled to my mind all the generous kings,
It is and none else, who would give his head for the strings.