On one of his campaigns he personally captured a Frankish king. He then consulted the amirs about the captive: should he put him to death, or accept the huge sum he was offering as ransom? The king had indeed offered a great amount for his release, and the opinions differed. In the end, Nur al-Din judged it best to free him in return for the ransom. The king was permitted to send one of his closest men back to his homeland to bring the money with which he would redeem himself; the sum arrived quickly, Nur al-Din set him free, and when that king reached his country he died there (1). This struck Nur al-Din and his companions as a wondrous sign.
Nur al-Din (2) used that money to build the bimaristan (hospital) (3) in Damascus, the finest of all institutions of its kind ever constructed (4). He stipulated that it be a waqf, a permanent charitable endowment, for the poor and the destitute (5). If certain medicines—so rare they could be found nowhere else—were available only there, the wealthy, too, were not to be denied them; anyone who came merely for a medical consultation (6) was likewise not refused its potions. For this reason Nur al-Din himself once visited the hospital and drank of its remedy. May Allah have mercy on him.
I say: some people assert that since the day it was founded its hearth-fire has never been extinguished up to our own time; Allah knows best.
He also constructed many caravanserais along the roads (7) and watch-towers, stationed guards in the places of danger, and installed carrier pigeons that brought him news with the greatest speed (8). He built ribats and khanqahs as well. He would gather jurists, shaykhs, and Sufis to visit him (9), honoring and exalting them; he loved the righteous.
On one occasion an amir spoke ill, in his presence, of a scholar—Qutb al-Din al-Naysaburi (10). Nur al-Din said to him, “Woe to you! If what you say is true, then he possesses so many good deeds (11)—far more than you—that they will expiate the sins you have mentioned, if you are truthful. As for me, by Allah, I do not believe you; and if you ever again mention him, or anyone else, in my presence with any evil, I shall punish you (12).” The man desisted and never spoke of him again.